Question

A metal rod of length 2 m is rotating with an angualr velocity of 100`"rads"^(-1)` in plane perpendicular to a uniform magnetic field of 0.3 T. The potential difference between the ends of the rod is
A. 30 V
B. 40 V
C. 60 V
D. 600 V

Answer 1

Correct Answer - C
Induced emf, when rod rotates in a vertical plane perpendicular to magnetic field is given as
`e=(1)/(2)Bl^(2)omega=(1)/(2)xx0.3xx2^(2)xx100=60V`