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A coil of area 2m^2 and resistane 4Omega...

A coil of area `2m^2` and resistane `4Omega` is placed perpendicular to a uniform magnetic field of `4T`. The loop is rotated by `90^@` in `0.1` second. Choose the correct options.

A

average induced emf in the coil is `8V`

B

average induced current in the circuit is `20A`

C

`2C `charge wil flow i the coil in above period

D

Heat produced in the coil in the above period can't be determined from the given datas

Text Solution

Verified by Experts

The correct Answer is:
B, C, D
`phi_i=BS cos0^2=(4)(2)=8Wb`
`phi_f=BScos90^2=0`
`/_\phi=8Wb`
`|e|=(/_\phi)/(/_\t)=8/0.1=80V`
`i=(|e|)/R=20A`
`/_\q=(/_\phi)/R=2C`
This current is not consist. So. We cannot find the heat generated unless current function with time is not known.
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