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Question:

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 is 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:

6 mV

12 mV

1 mV

2 mV

Solution:

Potential difference between two faces perpendicular to x-axis will be l(→V × →B) = 12 mV.