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A metallic rod of length ' A ' is tied to a string of length 2 A and made to rotate with angular speed ω on a horizontal table with one end of the string fixed. If there is a vertical magnetic field 'B' in the region, the e.m.f. induced across the ends of the rod is - •

1. 2 B 4 2 A ω
2. 2 B 5 2 A ω
3. 2 B 2 2 A ω
4. 2 B 3 2 A ω

Correct answer: 2 B 5 2 A ω

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