A capacitor of capacitance 2 F is charged to 50 V. The charging battery is then disconnected and a coil of inductance 5 mH is connected across it. Assuming that the coil has negligible resistance, the peak value of the current in the circuit will be

# XII (Science)

## Directions: In the following question, Statement – 1 (Assertion) is followed by Statement – 2 (Reaso….

Directions: In the following question, Statement – 1 (Assertion) is followed by Statement – 2 (Reason). The question has four options, out of which only one is correct. Statement – 1: A coil is connected in series with a bulb and this combination is connected to an a.c. source. If...

## An LCR circuit consists of an inductor, a capacitor and a resistor driven by a battery and connected….

An LCR circuit consists of an inductor, a capacitor and a resistor driven by a battery and connected by two switches S1 and S2 as shown in the figure. At time t = 0, when the charge on the capacitor plates is q, switch S1 is opened and S2...

## A step-down transformer transforms a supply line voltage of 2200 V into 220 V. The primary coil has ….

A step–down transformer transforms a supply line voltage of 2200 V into 220 V. The primary coil has 5000 turns. If the efficiency and power transmitted by the transformer are 90% and 8 kW, respectively, then the power supplied is

## In a transformer, loss due to eddy currents is minimised by ….

In a transformer, loss due to eddy currents is minimised by

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## An LCR series circuit with 100 resistance is connected to an AC source of 200 V and angular fre….

An LCR series circuit with 100 resistance is connected to an AC source of 200 V and angular frequency of 300 rad/s. When only the capacitance is removed, the current leads the voltage by 60°. When only the inductance is removed, the current leads the voltage by 60°. The impedance...

## An ideal transformer is supplied with a primary input power of 10 kilowatt. When the transformer is ….

An ideal transformer is supplied with a primary input power of 10 kilowatt. When the transformer is on load, the secondary current is 24 A. What is the potential difference applied to the primary if the primary to secondary turns ratio is 4 : 1?

## In an AC circuit, the current lags behind the voltage by π/3. The component(s) of the circuit is/….

In an AC circuit, the current lags behind the voltage by π/3. The component(s) of the circuit is/are

## When an AC source of emf E = E0 sin (100t) is connected across a circuit, the phase difference betwe….

When an AC source of emf E = E0 sin (100t) is connected across a circuit, the phase difference between the emf E and the current I in the circuit is observed to be /4 as shown in the figure below. If the circuit consists possibly only of R-C...

## An LCR series circuit with 100 resistance is connected to an AC source of 200 V and angular frequenc….

An LCR series circuit with 100 resistance is connected to an AC source of 200 V and angular frequency 300 rad/s. When only the capacitance is removed, the current leads the voltage by 60°. When only the inductance is removed, the current leads the voltage by 60°. The current...

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