A rectangular coil of 20 turns , each of area `10 cm^2`, is suspended freely in a uniform magnetic field of induction `2.5 xx10^-2` T with its plane inclined at `45^@` with the field. The torque acting on the coil when a current of 10 mA is passed through it is
A
`5.5xx10^-6Nm`
B
`3.5xx10^-6Nm`
C
`3.3xx10^-6Nm`
D
`5.3xx10^-6Nm`
Text Solution
Verified by Experts
The correct Answer is:
B
`tau_(n)= l IABcos theta ` `20 xx10^-2xx10^-3xx2.5xx10^-2xx0.7` prop 3.5xx10^6 Nm`.
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