Question

A short magnetic needle is pivoted in a uniform magnetic field of strength 1 T. When another magnetic field of strength $\sqrt { 3 } T$ is applied to the needle in a perpendicular direction, the needle deflects through an angle θ, where θ is

• A. 30^o
• B. 45^o
• C. 90^o
• D. 60^o

Answer 1

Answer: (D)

60^o

Answer 2

In balance condition

$B _ { 2 } = B _ { 1 } \tan \theta$

$\Rightarrow \tan \theta = \frac { \sqrt { 3 } } { 1 }$

$\Rightarrow \theta = 60 ^ { \circ }$