The magnetic field due to a short magnet at a point on its axis at distance $X\;cm$ from the middle point of the magnet is $200\;gauss$. The magnetic field at a point on the neutral axis at a distance $X\;cm$ from the middle of the magnet is

A bar magnet is $10\;cm$ long, and is kept with its north (N)- pole pointing north. A neutral point is formed at a distance of $15\;cm$ from each pole. Given the horizontal component of earth’s field to be 0.4 Gauss, the pole strength of the magnet is

A magnet of magnetic moment $50\,\hat i\,A{m^2}$ is placed in magnetic field $\vec B = \left( {0.5\,\hat i + 0.3\,\,\hat i} \right)T$. Torque acting on the magnet is

Force between two identical short bar magnets whose centers are $r$ metre apart is 8.1 N, when their axes are along the same line. If separation is increased to 3 $r$ and the axis are rearranged perpendicularly, the force between them would become

A short bar magnet is placed with its north pole pointing towards geographic north. The neutral point is located:

Two identical short bar magnets are placed at a distance $d$ apart with their axes perpendicular to each other. The magnetic field at the midpoint of the line joining their centers is:

Due to a small magnet, intensity at a distance $x$ in the end on position is $9\;gauss$. What will be the intensity at a distance $\frac{x}{2}$ on broad side on position

The distance of two points on the axis of a magnet from its centre is $10\;cm$ and $20\;cm$ respectively. The ratio of magnetic intensity at these points is $12.5\;:1$. The length of the magnet will be

Two short magnets having magnetic moments in the ratio $27\;:8$, when placed on opposite sides of a deflection magnetometer, produce no deflection. If the distance of the weaker magnet is 0.12 m from the centre of deflection magnetometer, the distance of the stronger magnet from the centre is

The magnetic potential at a point on the axial line of a bar magnet of dipole moment $M$ is $V$. What is the magnetic potential due to a bar magnet of dipole moment $\frac{M}{4}$ at the same point

At a certain distance from a short bar magnet, the magnetic field strength is $B$. If the magnet is replaced by another magnet of the same length but double the magnetic moment, the new field strength at the same point will be: