Question

A compass needle oscillates with time period T at equator. Now the same needle is taken near to geomagnetic north pole, but maintained in the horizontal orientation. Then, time period of needle for small oscillations is

• A. Zero
• B. $\frac{T}{\sqrt{3}}$
• C. $\frac{T}{\sqrt{2}}$
• D. $\infty$

Answer 1

The correct option is D $\infty$

At Pole $B_H=0$ $\Rightarrow T=\infty$