Question

Time period of oscillations of a magnet of magnetic moment $M$ and moment of inertia $I$ in a vertical plane perpendicular to the magnetic meridian at a place where earth's horizontal and vertical component of magnetic field are $B_{H}$ and $B_{v}$ respectively is

• A. $T=2 \pi \sqrt{\frac{I}{M\left(B_{V}^{2}+B_{H}^{2}\right)^{1 / 2}}}$
• B. $T=2 \pi \sqrt{\frac{1}{M B_{v}}}$
• C. $\quad T=2 \pi \sqrt{\frac{I}{M B_{H}}}$
• D. Infinite

Answer 1

Answer: (B)

$T=2 \pi \sqrt{\frac{I}{M B v}}$