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JEE Main 2025 (22 Jan, Shift 2) · Motional EMF

Motional EMF question from JEE Main 2025 (22 Jan, Shift 2)

Q13JEE Main 2025 · 22 JAN · SHIFT 2Medium

Motional EMF

A rectangular metallic loop is moving out of a uniform magnetic field region to a field free region with a constant speed. When the loop is partially inside the magnetic field, the plot of magnitude of induced emf $(\varepsilon)$ with time $(t)$ is given by

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Answer: (b)

While partly inside, the cutting edge length $\ell$ (side along the boundary) is fixed.
Flux decreases at a steady rate: $\varepsilon = B\ell v =$ constant.
The $\varepsilon$ – $t$ graph is a horizontal line. So the answer is (b).

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