Electromagnetic...

The magnetic field in the cylindrical region shown in figure increases at a constant rate of 20 mT/sec. Each side of the square loop ABCD has a length of 1 cm and resistance of 4 Ω. Find the current in the wire AB if the switch S is closed

Two coils P and Q are placed co-axially and carry current I and I\' respectively

A pair of parallel conducting rails lie at right angles to a uniform magnetic field of 2.0 T as shown in the fig. Two resistors 10 Ω and 5 Ω are to slide without friction along the rail. The distance between the conducting rails is 0.1 m. Then

The current through a coil of self-inductance L = 2 mH is given by I = t²e^–t at time t. How long it will take tomake the e.m.f. zero

A conducting wire sits on smooth metal rails, as shown in figure. A variable magnetic field points out of the page. The strength of this magnetic field is increased linearly from zero. Immediately after the field starts to increase, what will be the direction of the current in the wire and the direction of the wire's motion ?

A rectangular loop has a sliding connector PQ of length l and resistance R Ω and it is moving with a speed v as shown in the figure. The set up is placed in an uniform magnetic field going into the plane of the paper. The three currents I₁ , I₂ , I are

A rectangular loop of length 1 and breadth b is placed at distance of x from infinitely long wire carrying current i such that the direction of current is parallel to breadth. If the loop moves away from the current wire in a direction perpendicular to it with a velocity v, the magnitude of the emf in the loop is ( μ₀ = permeability of free space)

One conducting U-tube can slide inside another as shown in figure, maintaining electrical contacts between the tubes. The magnetic field B is perpendicular to the plane of the figure. If each tube moves towards the other at a constant speed v, then the emf induced in the circuit in terms of B, l and v, where l is the width of each tube, will be

According to phenomenon of mutual inductance,