A coil of inductive reactance and resistance 1 Ω is connected to a 200 V, 50 Hz AC supply. The time lag between maximum voltage and current is
In the A.C. circuit shown, keeping 'K' pressed, if an iron rod inserted into the coil, the bulb in the circuit
glows less brightly
glows with same brightness (as before the rod is inserted)
gets damaged
glows more brightly
The output of a step down transformers is measured to be 48 V when connected to a 12 W bulb. The value of peak current is
C.
Given,
Output of step down transformer (Vs) = 48 V
Power associated with secondary coil (Ps) = 12 W
For secondary coil,
In the circuit shown in the figure, the AC source gives a voltage V = 20 cos (2000t). Neglecting source resistance, the voltmeter and ammeter reading will be
1.68 V, 0.47 A
0 V, 1.47 A
5.6 V, 1.4 A
0 V, 1.4 A