COMPASS

Two small magnets are placed horizontally perpendicular to magnetic meridian. Their north poles are at 30cm east and 20cm west from a compass needle. Compare the magnetic moments of the magnets, if compass needle remains undeflected.

(a) The diagram shows a bar magnet surrounded by four potting compasses. Copy the diagram and mark in it the direction of the compass needle for each of the case B, C and D. (b) Which is the north pole, X or Y ?

A magnetic compass shows a deflection when placed near a current-carrying wire. How will the deflection of the compass get affected if the current in the wire is increased? Support your answer with a reason.

A magnet compass is placed at the point 'X' , the mid point of the line segment joining AB along the axis of the coil of the electromagnetis in a horizontal plane . What would be the direction of the magnetic compass ? Explain.