Which of the following will induce a current in a loop of wire in a uniform magnetic field? a) decreasing the strength of the field b) rotating the loop about an axis parallel to the field c) moving the loop within the field d) all of the above e) none of the above

a) Decreasing the strength of the field b) Rotating the loop about an axis parallel to the field c) Moving the loop within the field d) Decreasing the strength of the field and moving the loop within the field Answer: d) Decreasing the strength of the field and moving the loop within the field. Explanation: Both decreasing the strength of the field (option a) and moving the loop within the field (option c) result in a change in magnetic flux, which, according to Faraday's Law, induces a current in the loop. Option b does not lead to induced current because rotating the loop about an axis parallel to the field keeps the angle between the magnetic field and the area vector constant, and thus, the magnetic flux remains unchanged.