Question

A magnetic field goes through a conducting loop of wire as shown. If the strength of magnetic field isdceasing, which statement is correct?

A) There will be no induced emf and no induced current.
B) There will be a counterclockwise induced emf, but no induced current.
C) There will be a clockwise induced emf, but no induced current.
D) There will be a clockwise induced current in the loop.
E) There will be a counterclockwise induced current in the loop.

Answer 1

If the strength of the magnetic field is decreasing, there will be a counterclockwise induced emf, but no induced current. The correct option is B.

Step-by-step explanation:

When a magnetic field passes through a conducting loop of wire, an induced emf and current are produced. According to Faraday's law of induction, the direction of the induced emf and current depend on the change in the magnetic field. In this case, if the strength of the magnetic field is decreasing, the correct statement is that there will be a counterclockwise induced emf, but no induced current.

The induced emf tries to oppose the decrease in the magnetic field, creating a counterclockwise emf but no current flow. Hence, B is the correct option.