Reactance of a capacitor of capacitance C µF for A.C freqency (400 / π) Hz is 25 ohm
Reactance of a capacitor of capacitance C µF for A.C freqency (400 / π) Hz is 25 ohm. The value of C is
Options
(a) 25 µF (b) 100 µF (c) 75 µF […]
Alternating Current
An A.C source is rated at 220 V, 50 Hz. The time taken for voltage to change
An A.C source is rated at 220 V, 50 Hz. The time taken for voltage to change from its peak value to zero is
Options
(a) 50 sec (b) 0.02 sec (c) 5 […]
A coil of resistance 20 ohm and inductance 5H is connected with a 100V battery
A coil of resistance 20 ohm and inductance 5H is connected with a 100 V battery. Energy stored in the coil will be
Options
(a) 62.5 J (b) 41.5 J (c) 125 J […]
If alternating source of primary coil on transformer is replaced by a Laclanche cell
If alternating source of primary coil on transformer is replaced by a Laclanche cell, the induced e.m.f in secondary coil will be
Options
(a) zero (b) unity (c) more (d) less
Correct Answer: […]
In an LCR series A.C circuit, the voltage across each of the components, L, C and R is 50V
In an LCR series A.C circuit, the voltage across each of the components, L, C and R is 50V. The voltage across the L.C combination will be
Options
(a) 50 V (b) 50 […]
A resistance of 20 ohm is connected to a source of an alternating potential V
A resistance of 20 ohm is connected to a source of an alternating potential V=220 sin (100 πt). The time taken by the current to change from its peak value to r.m.s value is