A circular coil of 100 turns and having an effective radius of `5cm` carries a current of `0*1` ampere. How much work is required to turn it in an external magnetic field of `1*5 weber//m^2` through `180^@` about an axis perpendicular to magnetic field. The plane of the coil is initially perpendicular to the magnetic field.

A circular coil of 100 turns and having an effective radius of `5cm` c

1.	A circular coil of 100 turns and having an effective radius of `5cm` carries a current of `01` ampere. How much work is required to turn it in an external magnetic field of `15 weber//m^2` through `180^@` about an axis perpendicular to magnetic field. The plane of the coil is initially perpendicular to the magnetic field.
Answer» Here, `N=100, r=5cm=005m`, `I=01amp., W=?, B=15Wb//m^2`, `theta_1=0^@, theta_2=180^@` Now, `area A =pir^2=314(005)^2sqm` `W=-MB(costheta_2-costheta_1)` `=-(NIA)B(costheta_2-costheta_1)` `=-100xx01xx314(005)^2xx15[cos180^@-cos0^@]` `=-314(005)^2xx15(-1,-1)=0*24J`

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