A rod AB moves with a uniform velocity v in a uniform magnetic field as shown in figure
(##HCV_VOL2_C38_E01_033_Q01##)

Options

A. `mg`
B. `2mg`
C. `(mg)/(3)`
D. `(2mg)/(3)`

Answer

B

Explanation

An open ………….
Volume of liquid inside container container is `(H^(3))/(4)` when container is moved with maximum possible acceleration.

`tan theta = (a)/(g) = 2 implies a = 2g`
Force due to left wall is
`((0+rho gh))/(2).H^(2) = (rho gH^(3))/(2) = 2mg`