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A small coil C with N=200 turns is mount...

A small coil `C` with `N=200` turns is mounted on one end of a balance beam and introduced between the poles of an electromagnet as shown in figure. The cross sectional area of coil is `A=1.0 cm^(2)`, length of arm `OA` of the balance beam is `l=30 cm`. When there is no current in the coil the balance is in equilibrium. On passing a current `I=22 mA` through the coil the equilibrium is restored by putting the additional counter weight of mass `Deltam=60 mg` on the balance pan. Find the magnetic induction at the spot where coil is located.

A

`0.4 T`

B

`0.3 T`

C

`0.2 T`

D

`0.1 T`

Text Solution

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The correct Answer is:
A
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