1.

The earth's magnetic field at a given point is 0.5xx10^(-5) "Wb m"^(-2) . This field is to be annulled by magnetic induction at the centre of a circular loop of radius 5 cm. The current required to be flown in the loop is nearly

Answer»

0.2 A
0.4 A
`4 A`
`40 A`

SOLUTION :As `B=(mu_0I)/(2R)=B_H`
`therefore I=(2B_H R)/mu_0 =(2xx0.5xx10^(-5)xx0.05)/(4PIXX10^(-7))`= 0.3978 `approx` 0.4 A


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