Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-3>Q 79

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A resistor $R$ and a capacitor of capacitance $2 μF$ in series are connected through a switch to $200 V$ direct supply. Across the capacitor is a neon bulb that lights up at $120 V$ . Calculate the value of $R$ to make the bulb light up $5 s$ after the switch has been closed $(\log_{10} 2.5 = 0.4)$ .

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Important Questions on Current Electricity

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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-3>Q 80

A combination of two identical capacitors, a resistor

R

and a

D C

voltage source of voltage

6 V

is used in an experiment on a

(C - R)

circuit. It is found that for a parallel combination of the capacitor the time in which the voltage of the fully charged combination reduces to half its original voltage is

10 second

. For series combination, the time needed for reducing the voltage of the fully charged series combination by half is

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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-4>Q 1

Each of the batteries shown in figure has an emf equal to $10 V$ . Find the magnetic field $B$ at the point $P$ .

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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-4>Q 2

In the circuit shown in figure, the capacitors are initially uncharged. The current through resistor $P Q$ just after closing the switch is,

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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-4>Q 3

An uncharged capacitor of capacitance

4 μF

, a battery of emf

12 V

and a resistor of

2.5 MΩ

are connected in series. The time after which

V_{C} = 3 V_{R}

is (take,

\ln 2 = 0.693

),