Section 1

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The force on a particle in a magnetic field is the idea behind electromagnetic pumping. It is used to pump metallic fluids (such as sodium) and to pump blood in artificial heart machines. The basic design is shown below. An electric field is applied perpendicular to a blood vessel and to a magnetic field. Explain how ions are caused to move. Do positive and negative ions feel a force in the same direction?

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Cards (46)

Section 1

(46 cards)

The force on a particle in a magnetic field is the idea behind electromagnetic pumping. It is used to pump metallic fluids (such as sodium) and to pump blood in artificial heart machines. The basic design is shown below. An electric field is applied perpendicular to a blood vessel and to a magnetic field. Explain how ions are caused to move. Do positive and negative ions feel a force in the same direction?

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Back

With two identical lightbulbs and two identical batteries, how would you arrange the bulbs and batteries in a circuit to get the maximum possible total power to the lightbulbs? (Assume the batteries have negligible internal resistance)

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Back

What is the difference between magnetic flux and magnetic field?

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Back

In what direction will the current in figure below move if the rode moves to the left, which decreases the area of the loop to the left.

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Back

Explain in detail how you could measure the internal resistance of a battery.

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Back

What device converts electrical energy into mechanical energy

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electric motor

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a magnet is _____, which means that it has two distinct and opposite ends

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polarized

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What is emf

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potential difference determined by the chemical reactions in the battery and equals the terminal voltage when no current is drawn

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The magnetic flu passing through a loop is what to the product of the area of the loop times the perpendicular component of the uniform magnetic field

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equal

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A beam of electrons is directed toward a horizontal wire carrying a current from left to right. In what direction is the beam deflected?

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Back

What is the path of a charged particle moving perpendicular to a uniform magnetic field

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a circle

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what changes mechanical energy into electrical energy

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generator

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The magnetic field due to current in wires in your home can affect a compass. Discuss the problem in terms of currents, depending on whether they are ac or dc, and their distance away.

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Back

A horizontal current-carrying wire, free to move in Earth's gravitational field, is suspended directly above a second, parallel, current-carrying wire. A) In what direction is the current in the lower wire? B) Can the upper wire be held in stable equilibrium due to magnetic force of the lower wire? Explain.

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Back

A battery behaves like a source of emf in series with an

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internal reistance

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If a negatively charged particle enter a region of uniform magnetic field which is perpendicular to the particle's velocity, will the kinetic energy of the particle increase, decrease, or stay the same? Explain your answer. (Neglect gravity and assume there is no electric field)

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Back

What exists in a region of space where a magnetic force occurs

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magnetic field

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What would the advantage, in Faraday's experiments (Fig. 29-1) of using coils with many turns?

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Back

When applying Kirchhoff's loop rule does the sign (or direction) of a battery's emf depend on the direction of current through the battery? What about terminal voltage?

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Back

Two loops of wire are moving in the vicinity of a very long straight wire carrying a study current. Find the direction of the induced current in each loop.

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Back

Compare and contrast the magnetic field due to a long straight current and the electric field due to a long straight line of electric charge at rest.

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Back

A device that transforms another type of energy into electrical energy

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source of emf

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In figure below, determine the direction of the induced current in resistor RA a) When coil B is move toward coil A, b) when coil B is moved away from A, c) when the resistance RB is increased.

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Back

If the magnetic flux through a coil of wire change sin time, an emf

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is induced in the coil

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Compare and discuss the formulas for resistors and for capacitors when connected in series and in parallel.

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Back

What is a device used to measure very small currents

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galvanometer

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In the realtion F=IlxB which pairs of the vectos (F,L, B) are always 90, what are the other angles

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Back

You have a single 60-W bulb on in your room. How does the overall resistance of your room's electric circuit change when you turn on an additional 100-W bulb?

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Back

A magnet created when there is a current through a coil of wire I called

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electromagnet

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what produces magnetic field

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electric currents

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Suppose you are holding a circular ring of wire and suddenly thrust a magnet, South Pole first, away from you toward the center of the circle. Is a current induced in the wire? Is a current induced when the magnet is held steady within the ring? Is a current induced when you withdraw the magnet? In each case, if your answer is yes, specify the direction.

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Back

The induced emf can produce a current whose magnetic field opposes the original change in flux

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Lenz's law

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A ___ is a wire ocil in an electic motor mae of many loops mounted on a shaft or axle

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armature

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Q4. Two lightbulbs of resistance R1 and R2 (R2>R1) and a battery are all connected in series. Which bulb is brighter? What if they are connected in parallel? Explain.

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Back

magnet has how many poles

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two

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Can a copper wire and an aluminum wire of the same length have the same resistance? Explain.

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Yes. They might have the same resistance if the aluminum wire is thicker. If the lengths of the wires are the same, then the ratios of resistivity to cross-sectional area of the aluminum is also larger by the same proportion, the two wires will have the same resistance.

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Long coil of wire that contains many loops is called an

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solenoid

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Draw the magnetic field lines around a straight section of wire carrying a current horizontally to the left.

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Back

Suppose the cylindrical conductor of Fig. 28-11a has a concentric cylindrical hollow cavity inside it (so it looks like a pipe). What can you say about B in the cavity?

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Back

An enclosed transformer has four wire leads coming from it. How could you determine the ratio of turns on the two coils without taking the transformer apart? How would you know which wires paired with which?

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Back

What quantity is measured by a battery rating given in ampere-hours (A*h)?

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A battery rating in ampere-hours gives the total amount of charge available in the battery.

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If the emf in a circuit remains constant and the equation P=V^2/R indicates that the power dissipated in a resistor decreases if the resistance is increased, whereas the equation P=I^2 R implies the opposite. Is there a contradiction here? Explain.

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If the emf in a circuit remain constant and the resistance in the circuit is increased, less current will flow, and the power dissipated in the circuit will decrease. Both power equations support this result. If the current in a circuit remains constant and the resistance is increased, then the emf must increase and the power dissipated in the circuit will increase. Both equations also support this result. There is no contradiction, b/c the voltage, current, and resistance are related to each other by V=IR.

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Can the terminal voltage of a battery ever exceed its emf? Explain.

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Back

The number of magnetic field lines that pass through a surface is called

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magnetic flux

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What is the SI unit for a magnetic field

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Telsa

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A group of neighboring atoms whose electrons' magnetic fields all align in the same direction is called a

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domain

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