question_answer

A solid metal cube of edge length 2 cm is moving in a positive y-direction at a constant speed of 6 m/s. There it’, a uniform magnetic field of 0.1 T in the positive z- direction. The potential difference between the two faces of the cube perpendicular to the x-axis, is - [JEE Main 10-Jan-2019 Morning]

A) 2 mV

B) 12 mV

C) 6 mV

D) 1 mV

Correct Answer: B

Solution :

[b]

Due to magnetic force on electron charge separation get develop as shown in figure

At steady state

Potential difference between two faces