Explanation
when the contact is suddenly broken, self induced current flows in the direction of main current. Therefore, the bulb B will become suddenly bright.
Induced currents at clockwise. Therefore, induced mag field is into the plane of the paper. As it opposes the increasing inducing field, the inducing field must be out of the plane of the paper.
As resistance of 1 H coil is zero, the entire current flows through the coil. Current through 10 Ω resistance is zero.
Graph shows that alternating current lags behind alternating voltage by a phase angle of 900. Therefor, the circuit must contain a pure inductor.
Through L, when current is maximum, voltage is minimum.
Soft iron is the best material for the core of a transformer as it involves minimum energy loss.
In dc ammeter, a coil is free to rotate in the magnetic field of a fixed magnet.
If an alternating current is passed through such a coil, the torque will reverse it’s direction each time the current changes direction and the average value of the torque will be zero.
At resonance, LCR circuit behaves as purely resistive circuit. For purely resistive circuit power factor = I
Please disable the adBlock and continue. Thank you.