A compass needle placed at a distance r from a short magnet in tan A position showns a deflection of `60^(@)`. If the distance is increased to `r(3)^(1//3)`, then the deflection of the compass needle is:

Two short bar magnets have equal pole stengths but one is twice as long as the other one . The short magnet is placed at a distance of 30 cm in tan A position form the compass needle . The longer magnet must be placed on the other side of the compass needle for no deflection at a distance of .

When current is passed through the conductor, the compass needle deflects. Why?

A deflection magnetometer is placed with its arm along the east-west direction (tan A position) and a short bar magnet is placed symmetrically along its axis at some distance with its north pole pointing towards east. In this position the needle of the magnetometer shows a deflection of 60^(@) . If we double the distance of the bar magnet, then the deflection will be

A deflection magnetometer is placed with its arm along the east-west direction (tan A position) and a short bar magnet is placed symmetrically along its axis at some distance with its north pole pointing towards east. In this position the needle of the magnetometer shows a deflection of 60^(@) . If we double the distance of the bar magnet, then the deflection will be

What change is observed in the deflection of the compass needle placed at a point near a straight current-carrying conductor if the a] current through the conductor is increased ? b] direction of current in the conductor is reversed ? c] compass is moved away from the conductor ?