A magnetic needle lying parallel to a magnetic field requires W units of work to turn it through 60o. The torque needed to maintain the needle in this position will be
see full answer
Your Exam Success, Personally Taken Care Of
1:1 expert mentors customize learning to your strength and weaknesses – so you score higher in school , IIT JEE and NEET entrance exams.
An Intiative by Sri Chaitanya
a
2W
b
3 W
c
W
d
32W
answer is B.
(Unlock A.I Detailed Solution for FREE)
Best Courses for You
JEE
NEET
Foundation JEE
Foundation NEET
CBSE
Detailed Solution
W=−MBcos60∘−cos0∘=−MB12−1=12MB ∴MB=2W Now τ=MBsinθ=2Wsin60∘=2W(3/2)=3W