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A series R-C circuit is connected to an alternating voltage source. Consider two

A series R-C circuit is connected to an alternating voltage source. Consider two situations: (A) When capacitor is air filled (B) When capacitor is mica filled Current through resistor is i and voltage across capacitor […]

A resistance R draws power P when connected to an AC source. If an inductance

A resistance R draws power P when connected to an AC source. If an inductance is now placed in series with the resistance, such that the impedance of the circuit becomes Z the power drawn […]

A transformer having efficiency of 90% is working on 200 V and 3kW power supply

A transformer having efficiency of 90% is working on 200 V and 3kW power supply. If the current in the secondary coil is 6 A, then the voltage across the secondary coil and the current […]

An alternating voltage e=200s in100t is applied to a series combination

An alternating voltage e=200s in100t is applied to a series combination of R= 30Ω and an inductor of 400 mH. The power factor of the circuit is

Options

(a) 0.01 (b) 0.05 (c) […]

An ideal coil of 10 H is connected in series with a resistance of 5Ω and a battery

An ideal coil of 10 H is connected in series with a resistance of 5Ω and a battery fo 5 V. 2 second after the connection is made, the current flowing in ampere in the […]

In an AC circuit the potential differences across an inductance and resistance joined

In an AC circuit the potential differences across an inductance and resistance joined in series are respectively 16 V and 20 V. The total potential difference of the source is

Options

(a) 20.0 […]

An electric lamp is connected to 220 V, 50 Hz supply. Then the peak voltge is

An electric lamp is connected to 220 V, 50 Hz supply. Then the peak voltge is

Options

(a) 210 V (b) 211 V (c) 311 V (d) 320 V

311 V

In the series resonance the value of impedence is 3 Ω and the resistance is 4Ω,

In the series resonance the value of impedence is 3 Ω and the resistance is 4Ω, then the value of power factor of the circuit is

Options

(a) (4/3) (b) (3/4) (c) zero […]

An electric bulb has a rated power of 50W at 100 V. if it used on an a.c. source

An electric bulb has a rated power of 50W at 100 V. if it used on an a.c. source 200V, 50 Hz, a choke has to be used in series with it. This choke should […]

Two tangent galvanometers A and B have coils of radii 8 cm and 16 cm respectively

Two tangent galvanometers A and B have coils of radii 8 cm and 16 cm respectively and resistance 8 Ω each.They are connected in parallel with a cell of emf 4 V and negligible internal […]

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