An electromagnet is created by wrapping an iron nail with wire. The two ends of

Question

An electromagnet is created by wrapping an iron nail with wire. The two ends of the wire are connected to the positive and negative terminals of a power supply. A copper loop is held near one end of the nail. For each of the following separate 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 your reasoning The power supply is held at a steady value of 3 volts. The power supply is steadily decreased from 3 volts to 0 volts The power supply is held at a steady value of 0 volts The power supply is steadily Increased from 0 volts to 3 volts. Now 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

magnetic filed due to soleniod is towards copper coil

a.) if currnet is staedy the there is no chnage in magnetic flux inside coil hence there will be no induce current in loop.

b.) as power supply decreases hence magnetic flux also gets decreases in coil and hence there is change in magnetic flux so current will induce in coil as magnetic flux decreases so current will induce in such a direction by whic it opposes the changes and hence down the front of loop current will flow into coil.

c.) No current will inducce,  if currnet is staedy the there is no chnage in magnetic flux inside coil hence there will be no induce current in loop.

d.) Up the front of loop

as power supply increases hence magnetic flux also gets increases in coil and hence there is change in magnetic flux so current will induce in coil as magnetic flux increases so current will induce in such a direction by whic it opposes the changes and hence up the front of loop current will flow into coil.

2.) yes current will flow because magnetic flux gets decreses in coil,direction will down the front

as power supply decreases hence magnetic flux also gets decreases in coil and hence there is change in magnetic flux so current will induce in coil as magnetic flux decreases so current will induce in such a direction by whic it opposes the changes and hence down the front of loop current will flow into coil.

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