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A conducting rod of 1 m length and 1 kg ...

A conducting rod of 1 m length and 1 kg mass is suspended by two vertical wires through its ends. An external magnetic field of 2 T is applied normal to the rod. Now the current to be passed through the rod so as to make the tension in the wires zero is
[Take `g=10ms^(-2)`]

A

A)0.5 A

B

B)15 A

C

C)`5 A`

D

D)1.5 A

Text Solution

Verified by Experts

The correct Answer is:
C
Magnetic force on the rod = `BIl`
Weight of the rod = `mg`
For no tension in wire, `BIl=mg`
or `I=(mg)/(Bl)=(1xx10)/(2xx1)=5A`
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