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Q.

The magnetic needle of a V.M.M completes 10 oscillations in 92 seconds. When a small magnet is placed in the magnetic meridian 10cm due north of needle with north pole towards south completes 15 oscillations in 69 seconds. The magnetic moment of magnet ( BH = 0.3G) is

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a

4.5Am2

b

0.45Am2

c

0.75 Am2

d

0.225Am2

answer is C.

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Detailed Solution

T1=9.2S,T2=4.6S and T1T2=B2B1⇒9.24.6=B-BHBH⇒B=5BH=1.5×10-4T⇒Mo4π2Md3=1.5×10-4⇒M=0.75Am2
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