question_answer

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 q, where q is [KCET 1999]

A)            30o

B)            45o

C)            90o

D)            60o

Correct Answer: D

Solution :

           In balance condition \[{{B}_{2}}={{B}_{1}}\tan \theta \] \[\Rightarrow \tan \theta =\frac{\sqrt{3}}{1}\] \[\Rightarrow \theta ={{60}^{o}}\]