Magnetism and M...

Two parallel, long wires carry currents t, and $$i_1$$ with $$i_1 > i_2$$. When the currents are in the same direction, the magnetic field at a point midway between the wires is $$10 pT$$. If the direction of $$i_2$$ is reversed, the field becomes $$30 pT$$. The ratio $$\frac{i_1}{i_2}$$ is

The variation of magnetic susceptibility with the temperature of a ferromagnetic material can be ploted as :

A coil of wire is placed in a changing magnetic field. If the number of turns in the coil is decreased, the voltage induced across the coil will

Lenz's law is in accordance with the law of :

Lenz's law is in accordance with the law of

Which one of the following statements best describes the nature of the field lines due to a bar magnet?

If the work done in turning a magnet of magnetic moment $$M$$ by an angle of $$90^o$$ from the magnetic meridian is n times the corresponding work done to turn it through an angle of $$60^o$$, then the value of $$n$$ is

A particle of charge q and mass m moves in a circular orbit of radius r with angular speed $$\omega$$. The ratio of the magnitude of its magnetic moment to that of its angular momentum depends on

A bar magnet falls with its north pole pointing down through the axis of a copper ring. When viewed from above, the current in the ring will be.

A diamagnmetic material in a magnetic field moves :