Question

Torques τ₁ and τ₂ are required for a magnetic needle to remain perpendicular to the magnetic fields at two different places. The magnetic fields at those places are B₁ and B₂ respectively; then ratio $\frac{B_{1}}{B_{2}}$ is
(a) $\frac{\tau_{2}}{\tau_{1}}$
(b) $\frac{\tau_{1}}{\tau_{2}}$
(c) $\frac{\tau_{1}+\tau_{2}}{\tau_{1}-\tau_{2}}$
(d) $\frac{\tau_{1}-\tau_{2}}{\tau_{1}+\tau_{2}}$

Answer 1

Hey

Torques τ₁ and τ₂ are required for a magnetic needle to remain perpendicular to the magnetic fields at two different places. The magnetic fields at those places are B₁ and B₂ respectively; then ratio $\frac{B_{1}}{B_{2}}$ is

(a) $\frac{\tau_{2}}{\tau_{1}}$

(b) $\frac{\tau_{1}}{\tau_{2}}$

(c) $\frac{\tau_{1}+\tau_{2}}{\tau_{1}-\tau_{2}}$

(d) $\frac{\tau_{1}-\tau_{2}}{\tau_{1}+\tau_{2}}$

A correct

Answer 2

Explanation:

(a) $\frac{\tau_{2}}{\tau_{1}}$