Electromagnetic...

Two parallel wires PQ and ST, placed a distance w apart, are connected by a resistor R as shown in the figure and placed in a magnetic field B which is perpendicular to the plane containing the wires. A rod CD connects the two wires. The power spent to slide the rod CD with a velocity v along the wires is (neglect the resistance of the wires and that of the rod)

As a result of change in magnetic flux linked to a closed loop as shown in the figure, an emf of V volt is induced in the loop. The work done (in joules) in taking a charge Q coulomb once along the loop is

A coil of metal wire is kept stationary with its plane perpendicular to a uniform magnetic field directed along the positive x-axis. The current induced in the coil

Two circular coils can be arranged in any of the three orientations shown below. Their mutual inductance will be

When current carrying coil C₂ is moved towards the coil C₁ connected in series with a galvanometer, the pointer in the galvanometer G

A wireloop of radius R confined in a plane is rotated in its plane with some angular velocity . A uniform magnetic field exists in the region. The emf induced is

When a bar magnet is pushed towards the coil connected in series with a galvanometer, the pointer in the galvanometer G

The figure below shows two coils placed close to each other. When the key K is pressed, a current starts building up in one of the coils. Then,

The figure below shows two coils placed close to each other. When the current through one coil is decreased gradually by shifting the position of the rheostat, then

An airplane, with 20 m wingspread, is flying at 250 ms^-1 parallel to the Earth's surface at a place where the horizontal component of Earth's magnetic field is 2 10^-5 T and angle of dip is 60°. The magnitude of the induced emf between the tips of the wings is

A circular loop of radius R, carrying current I, lies in xy-plane with its centre at origin. The total magnetic flux through xy-plane is

A metallic wheel with 8 metallic spokes, each of length r, is rotating at an angular frequency w in a plane perpendicular to a magnetic field B. The magnitude of the induced emf between the axle and the rim of the wheel is

A rectangular coil of copper wires is rotated in a magnetic field. The direction of the induced current changes once in each 

electromagnetic induction i.e currents can be induced in coils (Select the best)

Coils C₁ and C₂ are stationary. C₁ connected in series with one very small Diwali bulb while C2 is connected to a battery. If the connection is suddenly snapped

In a car spark coil, an emf of 40000 volts is induced in its secondary winding when the current in its primary winding changes from 4 A to zero in 10 s. The mutual inductance between the primary and the secondary windings of the spark coil is

Calculate magnetic flux density of the magnetic field at the centre of a circular coil of 50 turns, having a radius of \(0.5 \mathrm{~m}\) and carrying a current of 5 A.

The dimensional equation for magnetic flux is:

What is the self-inductance of an air-core solenoid of length 3.14 m and cross-sectional area 10^–3 m² with 500 turns?

According to Faraday's law