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A copper rod of mass m rests on two hori...

A copper rod of mass m rests on two horizontal rails distance L apart and carries a current of I from one rail to the other. The coefficient of static friction between rod and rails is `mu_(s)` What are the (a) magnitude and (b) angle (relative to the vertical) of the smallest magnetic field that puts the rod on the verge of sliding?

A

C is dimensionless constant

B

B has dimensions of -1 in length

C

the dimensional formula of A is `ML^(-2)T^(-1)`

D

all the above are true.

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The correct Answer is:
D
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