Discussion
A metal rod of length 0.5 m moves with its length perpendicular to a uniform magnetic field of 0.2 T with a velocity of 3 ms−1 . The induced emf in the rod is
Answer: C
The induced emf is 0.3 V.
For a rod moving perpendicular to the field with its length perpendicular to both the field and its velocity,
\[ \varepsilon = Blv = 0.2 \times 0.5 \times 3 = 0.3\ \text{V} \]
0.6 V doubles the result, and 0.1 or 0.2 V leave out one of the three factors.
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