Question

For a vibration magnetometer, the time ** of suspended bar magnet can be reduced by -

(1) Moving it towards south pole

(2) Moving it towards north pole

(3) Moving it towards equator

(4) Anyone of them

Answer 1

Correct Answer is: (3) Moving it towards equator

T = √2π(I/MBH); BH = 0 at poles

BH = max at equator

BH ↑ ⇒ T ↓