First slide
Combined field of bar magnet and Earth; neutral point
Question

What is the magnetic field induction (of earth) when a bar magnet is placed with its axial line   perpendicular to magnetic meridian with North pole facing towards east to achieve neutral point?

Moderate
Solution

In this case two null points are obtained one N1  is in  (N-W  direction ) and another  N2
(S-E  direction)

We know  magnetic field induction at any point is
BH=μ04πMd31+3cos2θ
Here   tanθ=2

cosθ=13 BH=μ04π2Md3

  Hence key (2) is Correct & Remaining (1),(2),(4) are not correct

Get Instant Solutions
When in doubt download our app. Now available Google Play Store- Doubts App
Download Now
Doubts App