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A capacitor $C = 100 μ F$ is connected to three resistor each of resistance $1 kΩ$ and a battery of emf $9 V$ . The switch $S$ has been closed for long time so as to charge the capacitor. When switch $S$ is opened, the capacitor discharges with time constant -

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Important Questions on Current Electricity

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Beta Question Bank for Engineering: Physics>Chapter 24 - Current Electricity>Exercise-2>Q 8

A charged capacitor is allowed to discharge through a resistor by closing the key at the instant

t = 0

. At the instant

t = (l n 4) μ s

, the reading of the ammeter falls half the initial value. The resistance of the ammeter is equal to-

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Beta Question Bank for Engineering: Physics>Chapter 24 - Current Electricity>Exercise-2>Q 9

The circuit shown in the figure consist of a battery of emf

ε = 10 V

; a capacitor of capacitance

C = 1.0 μ F

and three resistor of values

R_{1} = 2 Ω, R_{2} = 2 Ω

and

R_{3} = 1 Ω

. Initially the capacitor is completely uncharged and the switch

S

is open. The switch

S

is closed at

t = 0

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Beta Question Bank for Engineering: Physics>Chapter 24 - Current Electricity>Exercise-2>Q 10

A capacitor of capacity

C

is charged to the steady potential difference

V

and connected in series with an open key and a pure resistor '

R

'. At time

t = 0

, the key is closed. If

I

is the current at time

t

, a plot of log

I

against time '

t

' is as shown in

(1)

in the graph. Later on of the parameters i.e.

V, R

C

is changed keeping the other two constant, and the graph

(2)

is recorded. Then-

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Beta Question Bank for Engineering: Physics>Chapter 24 - Current Electricity>Exercise-2>Q 11

In the circuit shown, the cell is ideal, with emf $15 V$ . Each resistance is of $3 Ω$ . The potential difference across the capacitor is

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Beta Question Bank for Engineering: Physics>Chapter 24 - Current Electricity>Exercise-2>Q 12

In the circuit shown in the figure, the switch

S

is initially open and the capacitor is initially uncharged.

I_{1}, I_{2}

and

I_{3}

represent the current in the resistance

2 Ω, 4 Ω

and

8 Ω

respectively.

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Beta Question Bank for Engineering: Physics>Chapter 24 - Current Electricity>Exercise-2>Q 13

A moving coil galvanometer has

150

equal divisions. Its current sensitivity is

10

divisions per

mA

and voltage sensitivity is

2

divisions per

mV

. In order that each division reads

1

V

, the resistance, in

ohms

, needed to be connected in series with the coil, will be

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Beta Question Bank for Engineering: Physics>Chapter 24 - Current Electricity>Exercise-2>Q 14

A current passes through a wire of non-uniform cross-section, which of the following quantities are independent of the cross-section?

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Beta Question Bank for Engineering: Physics>Chapter 24 - Current Electricity>Exercise-2>Q 15

In the circuit shown $E, F, G$ and $H$ are cells of e.m.f. $2 V, 1 V, 3 V$ and $1 V$ respectively and their internal resistances are $2 Ω, 1 Ω, 3 Ω$ and $1 Ω$ respectively then

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A capacitor C=100 μF is connected to three resistor each of resistance 1 kΩ and a battery of emf 9V. The switch S has been closed for long time so as to charge the capacitor. When switch S is opened, the capacitor discharges with time constant -

Important Questions on Current Electricity

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A capacitor $C = 100 μ F$ is connected to three resistor each of resistance $1 kΩ$ and a battery of emf $9 V$ . The switch $S$ has been closed for long time so as to charge the capacitor. When switch $S$ is opened, the capacitor discharges with time constant -