1)Which of the following has a magnetic field similar to that of a bar magnet? a

Question

1)Which of the following has a magnetic field similar to that of a bar magnet?

a)Current carrying straight wire

b)solenoid

c)A stationary charge

d)none of the above

2)When a bar magnet is pushed into a coil, which of the following parameters has an effect on the current induced in the coil?

a)The strength of the magnet

b)The speed of pushing it in

c)The radius of the coil

d)All of the above

3)Consider the expression V = Bvl derived in class for a rod of length, l moving with a velocity, v in a magnetic field, B. Which of the following conditions is necessary for this equation to be valid?

a)B should be perpendicular to v

b)B should be parallel to v

c)v should be parallel to l

d)B, v and l should all be pointing in the same direction

4)A loop, placed near a current carrying wire, is moved from point A to point B as shown below. Which          way will the induced current flow in the loop flow?

a)CW

b)CCW

c)depends on the magnitude of the current flowing through the wire

d)need more info

Explanation / Answer

1) b) solenoid

The magnetic field produced by electric current in a  bar magnet is similar to that of a solenoid coil

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2) d)All of the above

The strength of the magnetic field, the speed of the relative motion between the coil and the magnet and radius are effected

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a)B should be perpendicular to v

for perpendicular theta = 90 deg

V = B l v sin 90 = B l v

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