The frequncy of vibration in a vibration magnetometer of the combination of two bar magnets of magnetic moments M_1 and M_2 is 6 ~Hz when like poles are tied and it is 2 ~Hz when the unlike poles are tied together, then

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Correct answer: B. 5: 4

In the sum and difference method of vibration magnetometer, (M_1)/(M_2)=(T_2^2+T_1^2)/(T_2^2-T_1^2) Here, T_1=(1)/(n_1)=(1)/(6) ~sT_2=(1)/(n_2)=(1)/(2) ~s(M_1)/(M_2)=((1)/(4)+(1)/(36))/((1)/(4)-(1)/(36))+((9+1)/(36))/((9-1)/(36))=(10)/(8)=(5)/(4)M_1: M_2=5: 4

The frequncy of vibration in a vibration magnetometer of the...

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