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 \(\vec { B } \).

A thin insulated wire forms a plane spiral of N = 100 tight turns carrying a current I = 8 m A (milli ampere). The radii of inside and outside turns are a = 50 mm and b = 100 mm respectively. The magnetic induction at the centre of the spiral is ______.

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 ________________.

If a current I is flowing in a straight wire parallel to the x-axis and magnetic field is in the y-axis then the wire experiences in _________________.

Define magnetic flux.

What is magnetic susceptibility?

Compare dia, para and ferro-magnetism.

What is meant by the horizontal component of Earth's magnetic field?

What is magnetic field?

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

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

In a certain region of space, electric field \(\vec { E } \) and magnetic field \(\vec { B } \) are perpendicular to each other. An electron enters the region perpendicular to the direction of both \(\vec { B } \) & \(\vec { E } \) and moves undeflected. Find the velocity of the electron.

A given galvanometer is to be converted into
(i) an ammeter
(ii) a voltmeter.
In which case will the required resistance be
(i) least
(ii) highest and why?

A rectangular current carrying loop placed 2 cm away from a long, street, current - carrying conductors. What is the direction and magnitude of the net force acting on the loop.

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

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

Deduce the expression for the torque \(\vec { \tau } \) when \(\hat { n } \) unit vector n is at an angle 8 with the field.

Two long and parallel street wires carrying current of 2A and 5A in the opposite direction are separated by a distance of 1 cm, Find the nature and magnitude of the magnetic force between them.