Q.

The distance of two points on the axis of a magnet from its centre are 10cm and 20cm, respectively. The ratio of magnetic intensity at these points is 12.5 : 1. The length of the magnet will be

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

5cm

b

25cm

c

10cm

d

20cm

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

B1B2=d1d2d22-l2d12-l22⇒12.51=1020400-l2100-l22⇒l = 5cmHence, length of magnet = 2l = 10cm
Watch 3-min video & get full concept clarity
score_test_img

Get Expert Academic Guidance – Connect with a Counselor Today!

whats app icon
The distance of two points on the axis of a magnet from its centre are 10cm and 20cm, respectively. The ratio of magnetic intensity at these points is 12.5 : 1. The length of the magnet will be