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?
In this case two null points are obtained one is in (N-W direction ) and another
(S-E direction)
We know magnetic field induction at any point is
Here
Hence key (2) is Correct & Remaining (1),(2),(4) are not correct