Two small magnets each of magnetic moment 10A-m^2 are placed in end on position 0.1m apart from their centres. The force acting between them will me?

1. 0.6N
2. 0.06N
3. 0.06*10^7 N
4. 0.6*10^7 N.

[AP ch8 pg 76 Q59]

Four long co-axial thin walled cylindrical conductor A, B, C and D have radii R. 2R 3R and 4R respectively. A and C carry current I and 31 respectively to plane of paper on the other hand, B and D carry and 41 respectively outward to plane of paper. Then 21

I need solution of these questions.............................Magnetic effect of current

A freely suspended iron rod does not point at N-S directions alwalys .why

 

 

What is magnetic entropy change? For my knowledge, I know entropy is randomness or disorder. So here that magnetic refers to the magnetic dipole moments?

Derive the relation between magnetic field intensity (H) and magnetization (M) for a magnetic material placed in a magnetizing field.