At a plane the value of horizontal component of the eart's magnetic field `H` is `3xx10^(-5)weber//m^(2)`. A metallic rod `AB` of length `2m` placed in east-west direction, having the end `A` towards east, falls vertically downward with a constant velocity of `50 m//s`. which end of the rod becomes positively charged and what is the value of induced potential difference between the two ends?

Options

A. `End A,3xx10^(-2)`
B. `End A,3 mV`
C. `End B,3xx10^(-3) mV`
D. `End B,3mV`

Answer

B

Explanation

Induced potential difference between two ends `=B//v=B_(H)lv`
`=3xx10^(-5)xx2xx50=30xx10^(-3) "volt" =3` millivolt by fleming's right hand rule, end `A` becomes positively charged.