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1. For each of the following seperate cases, state whether the induced electric

ID: 1310073 • Letter: 1

Question

1. For each of the following seperate cases, state whether the induced electric current in the copper loop will be up the front of the loop, down the front of the loop, or zero. Explain reasoning.

(a) The power supply is held at a steady value of 3 volts.

(b) The power supply is steadily decreased from 3 volts to 0 volts.

(c) The power supply is held at a steady value of 0 volts.

(d) The power supply is steadily increased from 0 volts to 3 volts.

2. Suppose the power supply is set at a steady 3 volts, and the copper loop is moved to the right, directly away from the nail. In this situation, will a current flow in the loop? If so, in what direction? Explain.

Explanation / Answer

the induced electric current in the copper loop will be in the direction such that it resists the change in magnetic field in side the loop

A)

in this case

As the power supply is steady, the magnetic field is constant inside copper loop so the induced current in loop is ZERO

B)

As the power supply is decreasing , the magnetic field which is acting from left to right through the loop is decreasing, the induced current will be in the direction such that it resists this change. therefore the magnetic field due to induced current should be from left to right through the loop. To get this , by amperes law, the current in the loop should be up the front of the loop

C)

As the power supply is steady, the magnetic field is constant ( zero) inside copper loop so the induced current in loop is ZERO

D)

As the power supply is increasing , the magnetic field which is zero through the loop is increasing and in the direction from left to right , the induced current will be in the direction such that it resists this change. therefore the magnetic field due to induced current should be from right to left through the loop. To get this , by amperes law, the current in the loop should be down the front of the loop

2)

As the copper loop is moved to the right, directly away from the nail , the magnetic field which is acting from left to right through the loop is decreasing, the induced current will be in the direction such that it resists this change. therefore the magnetic field due to induced current should be from left to right through the loop. To get this , by amperes law, the current in the loop should be up the front of the loop

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