The horizontal component and vertical component of Earth’s magnetic field at a place are 0.15 G and 0.26 G respectively. Calculate the angle of dip and resultant magnetic field. (G - gauss, cgs unit for magnetic field 1G = 10^–4 T)

Let the magnetic moment of a bar magnet be \(\overset { \rightarrow }{ { p }_{ m } } \) whose magnetic length is d = 2l and pole strength is q_m. Compute the magnetic moment of the bar magnet when it is cut into two pieces
(a) along its length
(b) perpendicular to its length.

Compute the magnetic length of a uniform bar magnet if the geometrical length of the magnet is 12 cm. Mark the positions of magnetic pole points.

Calculate the magnetic flux coming out from closed surface containing magnetic dipole (say, a bar magnet) as shown in figure.

The repulsive force between two magnetic poles in air is 9 x 10^–3 N. If the two poles are equal in strength and are separated by a distance of 10 cm, calculate the pole strength of each pole.

Using the relation \(\overset { \rightarrow }{ B } =\mu _{ ° }(\overset { \rightarrow }{ H+ } \overset { \rightarrow }{ M } )\) show that \({ x }_{ m }={ \mu }_{ r }-{ 1 }\)

Two materials X and Y are magnetised whose values of intensity of magnetisation are 500 A m^–1 and 2000 A m^–1 respectively. If the magnetising field is 1000 A m^–1, then which one among these materials can be easily magnetized?

The following figure shows the variation of intensity of magnetisation with the applied magnetic field intensity for three magnetic materials X, Y and Z. Identify the materials X, Y and Z.

The magnetic field shown in the figure is due to the current carrying wire. In which direction does the current flow in the wire?

What is the magnetic field at the centre of the loop shown in figure?

Compute the magnitude of the magnetic field of a long, straight wire carrying a current of 1 A at distance of 1m from it. Compare it with Earth’s magnetic field.

A particle of charge q moves with velocity\(\vec { v } \) along positive y-direction in a magnetic field \(\vec { B } \) .Compute the Lorentz force experienced by the particle
(a) when magnetic field is along positive y - direction
(b) when magnetic field points in positive z - direction
(c) when magnetic field is in zy - plane and making an angle θ with velocity of the particle. Mark the direction of magnetic force in each case

Let E be the electric field of magnitude 6.0 x 10⁶ N C^–1 and B be the magnetic field magnitude 0.83 T. Suppose an electron is accelerated with a potential of 200 V, will it show zero deflection?. If not, at what potential will it show zero deflection.

Suppose a cyclotron is operated to accelerate protons with a magnetic field of strength 1 T. Calculate the frequency in which the electric field between two Dees could be reversed.

What is meant by magnetic induction?

Define magnetic flux.

Define magnetic dipole moment.

State Coulomb’s inverse law.

What is magnetic susceptibility?

What is magnetic permeability?

State Ampere’s circuital law.

Compare dia, para and ferro-magnetism.

What is meant by hysteresis?

A bar magnet having a magnetic moment \({ \vec { { p } } }_{ m }\) is cut into four pieces i.e., first cut into two pieces along the axis of the magnet and each piece is further cut along the axis into two pieces. Compute the magnetic moment of each piece.

A conductor of linear mass density 0.2 g m^–1 suspended by two flexible wire as shown in figure. Suppose the tension in the supporting wires is zero when it is kept inside the magnetic field of 1 T whose direction is into the page. Compute the current inside the conductor and also the direction of the current. Assume g = 10 m s^–2

A circular coil with cross-sectional area 0.1 cm² is kept in a uniform magnetic field of strength 0.2 T. If the current passing in the coil is 3 A and plane of the loop is perpendicular to the direction of magnetic field. Calculate
(a) total torque on the coil
(b) total force on the coil
(c) average force on each electron in the coil due to the magnetic field. (The free electron density for the material of the wire is 10²⁸ m^–3).

Define ampere.

Define magnetic declination and inclination.

What is resonance condition in cyclotron?

State Fleming's left hand rule.

Is an ammeter connected in series or parallel in a circuit? Why?

Explain the concept of velocity selector.

Why is the path of a charged particle not a circle when its velocity is not perpendicular to the magnetic field?

Give the properties of dia / para / ferromagnetic materials.

What happens to the domains in a ferromagnetic material in the presence of external magnetic field?

The resistance of a moving coil galvanometer is made twice its original value in order to increase current sensitivity by 50%. Find the percentage change in voltage sensitivity.