A circular coil of `100` turns and having a radius of `0*05m` carries a current of `0*1A`. Calculate the work required to turn the coil in an external magnetic field of `1*5T` through `180^@` about an axis perpendicular to the magnetic field. The plane of the coil is initially at right angles to the magnetic field.

A circular coil of `100` turns and having a radius of `0*05m` carries

1.	A circular coil of `100` turns and having a radius of `005m` carries a current of `01A`. Calculate the work required to turn the coil in an external magnetic field of `1*5T` through `180^@` about an axis perpendicular to the magnetic field. The plane of the coil is initially at right angles to the magnetic field.
Answer» Correct Answer - `024J` Here, `n=100`, `r=005m`, `I=01A` `W=?`, `B=15T`, `theta_1=0^@`, (When plane of coil is at `90^@` to B) `theta_2=180^@` `M=nIA=nI(pir^2)` `=100xx01(314)(005)^2` `=785xx10^-2Am^2` `W=-MB(costheta_2-costheta_1)` `=-785xx10^-2xx15(cos180^@-cos0^@)` `W=0*24J`

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