The earth's magnetic field is due to electrical currents produced by convective motion of metallic fluids (molten iron and nickel) in the outer core of the earth.This effect is known as

Due to the earth's magnetic field, charged cosmic ray particles

Due to the earth's magnetic field, charged cosmic ray particles

Locus of all points having same horizontal magnetic field on the magnetic map of earth is known as

A short bar magnet placed in a horizontal plane has its axis aligned along the magnetic north south direction. Null points are found on the axis of the magnet at 14cm from the centre of the magnet. The earth's magnetic field at the plane is 0*36G and the angle of dip is zero. What is the total magnetic field on the normal bisector of the magnet at the same distance as the null points (i.e. 14 cm) from the centre of the magnet? (At null points, field due to a magnet is equal and apposite to the horizontal component of earth's magnetic field).

Ampere's law provides us an easy way to calculate the magnetic field due to a symmetrical distribution of current. Its mathemfield expression is ointvecB.dl=mu_0I_("in") . The quantity on the left hand side is known as line as integral of magnetic field over a closed Ampere's loop. Only the current inside the Amperian loop contributes in

Assertion (A): The earth's magnetic field is due to iron present in its core. Reason (R ): At a high tempeature magnet losses its magnetic property or magnetism.

The phenomena of electromagnetic induction is: (a) the process of charging a body. (b) the process of generating magnetic field due to a current passing through a coil. (c) producing induced current in a coil due to relative motion between a magnet and the coil. (d) the process of rotating a coil of an electric motor.

A circular coil of radius 10 cm, 500 turns and resistance 2 Omega is placed with its plane prependicular to the horizontal component of the earth's magnetic field. It is rotated about its vertical diameter through 180^(@) in 0.25 s. Estimate the magnitude of the e.m.f and current induced in the coil. Horizotal component of earth's magnetic field at the place is 3 xx 10^(-5) T .

A: The earth's magnetic field not only varies from point to point in space, it also changes with time R: The earth's core is known to contain iron yet geologists do not regard this as a source of the earth's magnetism.