Moving Charges and Magnetism Test - 18

M = (length of magnet) x (pole strength).

When the magnet is cut into two equal parts, the length is halved or otherwise the pole strength becomes half.

In both cases magnetic moment. Becomes = M/2.

We know that unit of electric field is: Newton per coulomb or volt per meter…… (i)

And for magnetic field: tesla which is equal to: Newton second per coulomb meter... (ii)

Equation (ii) divided by eq (i):

Ratio inverse of meter per second.

One gauss is defined as one Maxwell per square centimetre. The cgs system has been superseded by the International System of Units (SI), which uses the tesla (symbol T) as the unit of magnetic flux density. One gauss equals 1 × 10⁻⁴ tesla.

A current carrying coil does not necessarily carry the electric charge. But it will always generate magnetic field therefore, energy in a current carrying wire is stored in the form of magnetic field.

A wire oriented in the east-west direction carries a current eastward. Direction of the magnetic field at a point to the south of wire is vertically down.