A particle having mass m and charge q accelerated through a potential difference V. Find the force experienced when it is kept under perpendicular magnetic field \(\vec { B } \).

Three wires of equal lengths are bent in the form of loops. One of the loops is circle, another is a semi-circle and the third one is a square. They are placed in a uniform magnetic field and same electric current is passed through them. Which of the following loop configuration will experience greater torque?

A wire of length l carrying a current I along the Y direction is kept in a magnetic field is given by \(\vec { B } =\frac { \beta }{ \sqrt { 3 } } =(\hat { i } +\hat { j } +\hat { k } )T.\) The magnitude of Lorentz force acting on the wire is _____.

The direction of the magnetic force on a positive charge moving in a magnetic field is given by ________________.

Consider the motion of a charged particle in a uniform magnetic field directed into the paper. If velocity v of the particle is in the plane of the paper, the charged particle will describe a _____________.

Lorentz force generally refers to force experienced by a charge due to combined action of _________________.

The unit of magnetic field is _______________.

The magnetic induction at the center of a circular coil having 5 turn and radius 2π cm carrying a current of 50 mA is ________________.

Magnetic flux density at the center of a circular coil of diameter 20 cm carrying a current 5 A kept in air is _______________.

The direction of the magnetic field due to a solenoid is given by ___________________.

The unit of pole strength (magnetic charge) is _______

The angular frequency of a charged particle moving in a uniform magnetic field ____________.

To convert a galvanometer into an ammeter we connect which one of the following to the galvanometer?

The direction of force on a current carrying conductor placed in a magnetic field is given by _____

The magnitude of the magnetic Lorentz force does not depend on ______

What is magnetic susceptibility?

What are the causes for earth's magnetic field according to Gover?

What is magnetic axis, magnetic meridian & magnetic equator?

Define magnetic flux density.

State Right hand thumb rule.

What is magnetic Lorentz force?

When is a galvanometer said to be sensitive?

Why the Phosphor - bronze wire is used as the suspension wire in moving coil galvanometer?

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

How is a galvanometer converted into (i) an ammeter and (ii) a voltmeter?

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.

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

Consider a magnetic dipole which on switching ON external magnetic field orient only in two possible ways i.e., one along the direction of the magnetic field (parallel to the field) and another anti-parallel to magnetic field. Compute the energy for the possible orientation.

A coil of a tangent galvanometer of diameter 0.24 m has 100 turns. If the horizontal component of Earth’s magnetic field is 25 x 10^–6 T then, calculate the current which gives a deflection of 60^o .

Explain the principle and working of a moving coil galvanometer.

Calculate the magnetic field inside and outside of the long solenoid using Ampere’s circuital law.

Write the value of
(i) Horizontal component &
(ii) vertical component of Earth's magnetic field.

Write the expression in a vector form for the
(i) Lorentz magnetic force \(\vec { F } \) due to a charge moving with velocity \(\vec { v } \) in a magnetic field \(\vec { B } \)  What is the direction of force?
(ii) If the magnetic force \(\vec { F } \) acting it is non-zero would the particle gain any energy?

Two identical charged produces moving with the same speed enter a region of uniform magnetic field. If one of these enters normal to the field direction and the other enters along a direction at 30° with the field. What would be the ratio of their angular frequencies.

How will the magnetic field intensity at the contre of a circular coil carrying current change if the current through the coil is doubled and the radius of the coil is halved?

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

An electron moving perpendicular to a uniform magnetic field 0.500 T undergoes circular motion of radius 2.50 mm. What is the speed of electron?

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.

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).

A non - conducting sphere has a mass of 100 g and radius 20 cm. A flat compact coil of wire with turns 5 is wrapped tightly around it with each turns concentric with the sphere. This sphere is placed on an inclined plane such that plane of coil is parallel to the inclined plane. A uniform magnetic field of 0.5 T exists in the region in vertically upward direction. Compute the current I required to rest the sphere in equilibrium.

Describe the motion of a charged particle in a uniform magnetic field.

A rectangular coil of area 2 x 10^-4 m² and 40 turns is pivoted about one of its vertical sides. The coil is in a radial horizontal field of 60G. What is the torsional constant of the hair springs connected to the coil if a current of 4.0 mA produces an angular deflection of 16°?