1.) If you move the coil in the figure toward the N pole of the large electromag

Question

1.) If you move the coil in the figure toward the N pole of the large electromagnet, would an electric current be induced? Assume that electromagnet produce constant uniform magnetic field.

2.) One coil is placed on top of another. The bottom coil is connected in series to a battery and a switch. With the switch closed, there is a clockwise current in the bottom coil. When the switch is opened, the current in the bottom coil decreases abruptly to zero. What is the direction of the induced current in the top coil, as seen from above while the current in the bottom coil decreases?

     a. Counterclockwise

     b. Clockwise

     c. Zero

     d. not enough information

3.) Four identical loops move at the same velocity toward the right in a uniform magnetic field inside the dashed lines, as shown in (Figure 1) . Which choice below best represents the ranking of the magnitudes (largest to smallest) of the induced currents in the loops?

a. 1=2=3=4

b. 3>4>2>1

c. 1=2>3=4

d. 1>2>3=4

e. 2=1=4>3

Explanation / Answer

1) Since there is change in the flux through the coil " no induced current is produced in the coil"

2) Answer is b clockwise This is because when current in the bottom coil reduces abruptely,the upper coil supports the this current by inducing a clockwise current in the upper coil.

4) d is currect answer

Here 1 has lage change in flus

2 less rate of flux

4 has no change in flux

3 has no change in flux

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