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A rigid circular loop of radius r and mass m lies in the x-y plane on a flat table and has a current i flowing in the it. At this particular place, the earth's magnetic field is `B= B_(x)hati+ B_(z)hatk` .The value of i. so that one edge of the loop lifts from the tables is

A

`(mg)/(pirsqrt(B_(x)^(2)+B_(z)^(2)))`

B

`(mg)/(pirB_(z))`

C

`(mg)/(pirB_(x))`

D

`(mg)/(pirsqrt(B_(x)B_(z)))`

Text Solution

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The correct Answer is:
C
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AAKASH SERIES-MOVING CHARGES AND MAGNETISM-EXERCISE-IA
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  17. A tangent galvanometer shows no deflection when a current is passed th...

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  19. The coil of a tangent galvanométer is put in the magnetic meridian.

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