A bar magnet is held perpendicular to a uniform magnetic field if the couple acting on the magnet is to be halved by rotating it, then the angle by which it is to be rotated is

see full answer

21% of IItians & 23% of AIIMS delhi doctors are from Sri Chaitanya institute !!

An Intiative by Sri Chaitanya

30o

45o

60o

90o

answer is C.

(Unlock A.I Detailed Solution for FREE)

Ready to Test Your Skills?

Check your Performance Today with our Free Mock Test used by Toppers!

Take Free Test

Detailed Solution

τ=MBsinθ ⇒τ∝sinθ ⇒τ1τ2=sinθ1sinθ2 ⇒ττ2=sin90sinθ2 ⇒sinθ2=12 ⇒θ2=300 So, bar magnet should be rotated by 600.

Watch 3-min video & get full concept clarity