A 1m long calculating rod rotates with an angular frequency of 400 rad `s^(-1)` an axis normal to the rod passing through its one one end. The other end of the rod is contact with a circular metallic ring. A constant magnetic field of 0.5 T parallel to the axis everywhere. Calculate the e.m.f. developed between the centre and the ring.

Options

A. 50 V
B. 100 V
C. 200 V
D. 125 V

Answer

B

Explanation

`e = (B l^(2) omega)/(2)`
= 100 V