Q 12-06-027NEETJEE MainMedium
A square loop of side $10$ cm and resistance $0.5\ \Omega$ is pulled out of a region of uniform field $0.5$ T at a steady $2$ m/s, with one side parallel to the field boundary. The current induced while it is leaving the field is
Answer: (A) $0.2$ A
Concept. While leaving, only the side still in the field cuts field lines: $\varepsilon = Blv$, $I = \dfrac{\varepsilon}{R}$.
Step 1. Emf. $0.5 \times 0.1 \times 2 = 0.1$ V.
Step 2. Current. $\dfrac{0.1}{0.5} = 0.2$ A.
Answer. $0.2$ A (Option A).
Solution by Sreeraj P, M.Sc Physics