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Torques tau(1) and tau(2) are required f...

Torques `tau_(1)` and `tau_(2)` are required for a magnetic needle to remain perpendicular to the magnetic fields at two different places. The magnetic field at those places are B1 and B2 respectively, then `(B_(1))/(B_(2))` is

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The correct Answer is:
B
Torque, `tau=MB sintheta `
`tau_(1)=MB_(1) sin90^(@)=MB_(1)`
`tau_(2)=MB_(2) sin90^(@)=MB_(2) or (MB_(1))/(MB_(2))=(tau_(1))/(tau_(2))`
`(B_(1))/(B_(2))=(tau_(1))/(tau_(2))` n
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