You are given a magnet. How will you use it to find north-south direction at a place ?

Assertion : When a bar magnet is freely suspended, it points in the north-south direction. Reason : The earth behaves as a magnet with the magnetic field pointing approximately from the geographic south to north.

You are given a bar. How will you identify experimentally whether it is made of a ferro-magnetic, paramagnetic or a diamagnetic material?

Answer the following: a) A circular loop of Radius R carries a current I . Obtain an expression for the magnetic field at a point on its axis at a distance of x from its centre. b) A conducting rod of length 2 m is placed on a horizontal table in north-south direction. It carries a current of 5 A from south to north. Find the direction and magnitude of magnetic force acting on the rod. Given that Earth's magnetic field at the place is 0.6 xx 10^(-4) T and angle of dip is (pi/6)

A deflection megnetometer is placed with its arms in north-south direction. How and where should a short magnet having M/B_H = 40 A m^2 T(-1) be placed so that the needle can stay in any position?

A freely suspended magnet aligns in the North-South direction.

How will you find the direction of the vector product of two vectors ?

You are provided with a glass stopper and a measuring cylinder. How will you proceed to find the density of stopper? Diagrams not required.

A long straight wire in the horizontal plane carries as curret of 75 A in north to south direction, magnitude and direction of field B at a point 3 m east of the wire is

You are given a magnetised bar and a compass needle. How will you mark polartiy at the ends of the bar ?

You are given a group of bacteria. How do you proceed to determine whether it is Gram '+ve' or Gram'-ve' bacteria ?