A rectangular metallic loop moves out of a uniform magnetic field region into a field-free region at constant speed. When partially inside, the plot of magnitude of induced emf (varepsilon) with time (t) is:

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EEJ MAIN Physics QUESTION #991

Question 1

A rectangular metallic loop moves out of a uniform magnetic field region into a field-free region at constant speed. When partially inside, the plot of magnitude of induced emf \((\varepsilon)\) with time \((t)\) is:

Linearly increasing graph
Decreasing curve (exponential)
Linearly increasing then constant
Constant (horizontal line)✔️

Correct Answer Explanation

As the loop exits at constant speed, the rate of change of flux is constant (\(\varepsilon = Bvl\) = constant). So the emf is constant with time — represented by a horizontal line. Answer key: option (4) = constant horizontal line.

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