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A small coil is introduced between the p...

A small coil is introduced between the poles of an electromagnet so that its axis coincides with the magnetic field direction. The cross-sectional area of the coil is equal to `S = 3.0 mm^2`, the number of turns is `N = 60`. When the coil turns through `180^@` about its diameter, a galvanometer connected to the coil indicates a charge `q = 4.5muC` flowing through it. Find the magnetic induction magnitude between the poles, provided the total resistance of the electric circuit equals `R = 40 Omega`.

A

`2.5T`

B

`1.5T`

C

`0.5T`

D

`5T`

Text Solution

Verified by Experts

The correct Answer is:
C
Similar to above problem
`/_\q=(2NBS)/R`
`:. B((/_\q)R)/(2NS)`
`=((4.5xx10^6)(40))/((2)(60)(3xx10^-6))`
`=0.5T`
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