Two circular loops of radii r and 2r have currents I and `I//2` flowing through them in clockwise and anticlockwise sense respectively. If their equivalent magnetic moments are `M_1` and `M_2`, what is the relation between `M_1` and `M_2`?

The radius of a circular loop is r and a current i is flowing in it. The equivalent magnetic moment will be

The radius of a circular loop is r and a current i is flowing in it. The equivalent magnetic moment will be

A long straight wire is coplanar with a current carrying circular loop of radius R as shown in Fig. Current flowing through wire and the loop is I_0 and I, respectively. If distance between centre of loop and wire is r=2R, calculate force of attraction between the wire and the loop.

A long straight wire is coplanar with a current carrying circular loop of radius R as shown in Fig. Current flowing through wire and the loop is I_0 and I, respectively. If distance between centre of loop and wire is r=2R, calculate force of attraction between the wire and the loop.

A circular loop has radius R and a current I flows through it. Another circular loop has radius 2R and a current 2I flows through it. Ratio of the magnetic fields at their centres is

Two concentric circular loops of radii r_(1) and r_(2) carry clockwise and anticlockwise currents i_(1) and i_(2) . If the centre is a null point, i_(1)//i_(2) must be equal to

Two concentric coplanar circular loops of radii r_(1) and r_(2) carry currents of respectively i_(1) and i_(2) in opposite direction (one clockwise and the other anticlockwise). The magnetic induction at the centre of the loops is half that due to i_(1) alone at the centre. if r_(2)=2r_(1) . the value of i_(2)//i_(1) is

Two concentric coplanar circular loops of radii r_(1) and r_(2) carry currents of respectively i_(1) and i_(2) in opposite direction (one clockwise and the other anticlockwise). The magnetic induction at the centre of the loops is half that due to i_(1) alone at the centre. if r_(2)=2r_(1) . the value of i_(2)//i_(1) is

If a current I flows through a loop of area A and the strength of the pole thus generated be q_(m) , the magnetic moment of the loop is