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In order to keep one magnetic needle, perpendicular to two magnetic fieldsB_1 and B_2, if the torques required are respectively tau_(1) and tau_(2) then (B_1)/( B_2)= ….....

Answer»

`tau_2/tau_1`
`tau_1/tau_2`
`(tau_1 + tau_2)/( tau_1- tau_2)`
`(tau_1 - tau_2)/(tau_1 + tau_2)`

SOLUTION :`tau= mB sin theta = m B`
`THEREFORE B= (tau)/(m)`
`therefore B PROP tau""(because m= " constant for a given MAGNETIC needle" )`
`therefore (B_1)/(B_2) = (tau_1)/( tau_2)`


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