Banner 0
Banner 1
Banner 2
Banner 3
Banner 4
Banner 5

Q.

An insulating rod of length l carries a charge q distributed uniformly on it.  The rod is pivoted at an end and is rotated at a frequency f about a fixed perpendicular axis. The magnetic moment of the system is 

see full answer

Talk to JEE/NEET 2025 Toppers - Learn What Actually Works!

Real Strategies. Real People. Real Success Stories - Just 1 call away
An Intiative by Sri Chaitanya

a

zero

b

13πqfℓ2

c

πqfl2

d

12πqfℓ2

answer is D.

(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

Question Image

At a distance ‘x’ consider a small element of width ‘dx’ .

As the element rotates, it can be considered as a current carrying loop.

Magnetic moment of the small element is 

dM=IA=dqTπx2=qldxfπx2

M=qfπl0lx2dx=qπfl23

Best Courses for You

JEE

JEE

NEET

NEET

Foundation JEE

Foundation JEE

Foundation NEET

Foundation NEET

CBSE

CBSE

score_test_img

Get Expert Academic Guidance – Connect with a Counselor Today!

whats app icon