Two magnets held together in earth's magnetic field when the same polarity together causes 12 v i b / min and when opposite poles 4 v i b / m i n . What is the ratio of magnetic moments?

Step-by-step solution

Here we use sum and difference method. M 2 M 1 = T 2 2 - T 1 2 T 2 2 + T 1 2 Where T 1 and T 2 are time periods T ∝ 1 n ( ∵ n i s f r e q u e n c y . ) ⇒ M 1 M 2 = n 1 2 + n 2 2 n 1 2 - n 2 2 = 12 2 + 4 2 12 2 - 4 2 = 144 + 16 144 - 16 = 10 8 = 1 . 25