Chemistry-
General
Easy
Question
A wire frame as shown in figure is made to rotate about a vertical axis passing through O. There exists a uniform horizontal magnetic field of induction B = 1 Tesla if 
If the frame rotates (slowly) about 'O' with angular velocity directed along Z-axis having magnitude w = 4rad/s, the potential difference between O & B is
- 4V
- none
The correct answer is: 4V
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