Question

The image below shows a loop of wire passing through a magnetic field at constant speed. which of the following statements best describes the current in the wire as the wire passes through the field

Answer 1

Step-by-step explanation:

The correct answer is: Magnetic field lines form circles that go around the wire.

Answer 2

C

Step-by-step explanation:

Correct Answer: C. The current decreases to zero as the loop approaches the midpoint, and then changes direction and increases as the loop continues past the midpoint.

Explanation: As the wire loop approaches the midpoint, the magnetic flux through the wire is increasing. This causes a current that moves clockwise in the wire (as seen from above). After passing the midpoint, the magnetic flux is decreasing, which causes the direction of the current in the wire to reverse. The current is now counterclockwise in the wire. At the midpoint, the current is zero. The change in direction can be inferred from Faraday’s law of electromagnetic induction:

V=−ΔΦMΔt

This law states that the voltage in the wire is equal to the negative of the change in magnetic flux over time. The sign of the magnetic flux changes when the flux goes from increasing to decreasing, so the voltage and the current are reversed as well.