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A coil is placed in a magnetic field such that the plane of the coil is perpendicular to the direction of the magnetic field. The magnetic flux through the coil can be changed (A) by changing the magnitude of the magnetic field within the coil; (B) by changing the area of the coil within the magnetic field; (C) by changing the angle between the direction of the magnetic field and the plane of the coil; (D) by reversing the magnetic field direction abruptly without changing its magnitude.

Asked in JEE Main 1st Feb 2nd Shift 2023 · Applications and conceptual

Answer: (2) A, B and C only

Step-by-step solution

Φ = BA cosθ. It changes if B changes (A), if A changes (B), or if the field is reversed (D), since Φ goes from +BA to -BA.

Changing the angle between the field and the plane of the coil (C) is the same as changing θ, but the option as written duplicates (A) and (B) in effect; the intended set is A, B and D.

Why the other options are wrong

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