Magnetism Mock Tests

A short bar magnet is placed in a magnetometer. The neutral points are found on the equatorial line at a distance of 10 cm from the centre of the magnet. If the horizontal component of Earth's magnetic field is 0.34 G, the magnetic moment of the magnet is:

Electromagnetic induction is the process of:

A galvanometer with coil resistance G and full-scale deflection current I_g is converted to a voltmeter of range V by connecting a resistance R in series. The same galvanometer is converted to an ammeter of range I by connecting a shunt resistance S in parallel. If R/S = V/I, then:

The magnetic field at the center of a circular coil of N turns, radius R, carrying current I is:

Magnetic field inside a long solenoid: B = μ₀nI = (4π × 10⁻⁷)(1000)(2) = 8π × 10⁻⁴ T.

A long straight wire carries current I₁ = 10 A upward. A second parallel wire at distance d = 0.05 m carries current I₂ = 5 A downward. A rectangular loop of wire (sides a = 0.1 m parallel to the wires, b = 0.05 m perpendicular) is placed with its near side at distance d from the first wire. The loop carries current I₃ = 2 A in the same direction as I₁ in the near side. The net force on the loop is:

The SI unit of magnetic flux is:

A charged particle moves in a circular path of radius R in a uniform magnetic field B perpendicular to its velocity. If the charge and mass of the particle are q and m respectively, the time period of revolution is