Electromagnetic Induction

Two coupled coils have self-inductances L1= 2 H and L2= 0.5 H, and a coefficient of coupling k= 0.9. Determine the turns N1/N2 of the two coils.

A piece of conductor 20 cm long moves across a magnetic field of 10,000 gauss at a velocity of 120 cm/sec. What voltage appears across the conductor?

Two coils having inductances of 20 mH and 50 mH are wound on top of each other. Calculate the mutual inductive between the two coils if the coupling coefficient k= 0.98

The current in the coil of a large electromagnet falls from 6A to 2A in 10ms. The induced emf across the coil is 100v. What is the self- inductance of the coil?

A 50 cm long conductor is moved in a field of density 1 Wb/m² at a velocity of 30 m/s. What is the emf induced if the motion is perpendicular to the field?

Two identical coupled coils have an equivalent inductance of 80mH when connected in series aiding and 35mH in series opposing. What is the value of the coefficient of coupling K.

When one coil of a magnetically coupled pair has a current of 5 A, the resulting fluxes \(\Phi_{11}\) and \(\Phi_{12}\) are 0.4 mWb and 0.8 mWb, respectively. If the turns are \(N_1 = 500\) and \(N_2 = 1{,}500\), find \(L_1\).

Two coupled coils have self-inductances \(L_1 = 50\) mH and \(L_2 = 200\) mH, and a coefficient of coupling k = 0.50. If \(i_1 = 5\sin 400t\) A, find the voltage at coil 2.

A conductor of length 1 meter moves at right angles to a magnetic field of flux density 1 Wb/m² with a velocity of 25 m/s. What is the induced emf in the conductor?

What is the value of inductance of a coil that induces 100 V when the current changes at the rate of 2 mA in 2 microseconds?

How much energy is stored by a 100 mH inductance with a current of 1 A?

A coil of 100 turns is cut by a magnetic field that increases at the rate of 40 Wb/min. What is the induced voltage?