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A battery is connected to a uniform resistance wire $A B$ and $B$ is earthed. Which one of the graphs below shows how the current density $J$ varies along $A B$ ?

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Important Questions on Electric Current and Circuits

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JEE Main

IMPORTANT

Chapterwise/Topicwise Daily Practice Problems (DPP) Electrostatics and Current Electricity JEE Main & Advanced>Chapter 5 - Electric Current and Circuits>DPP>Q 13

Two wires each of radius of cross-section

r

but of different materials are connected together end to end (i.e., in series). If the densities of charge carriers in the two wires are in the ratio

1 : 4

, the drift velocity of electrons in the two wires will be in the ratio

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Chapterwise/Topicwise Daily Practice Problems (DPP) Electrostatics and Current Electricity JEE Main & Advanced>Chapter 5 - Electric Current and Circuits>DPP>Q 14

A solid conductor has a cross-section area $1 {cm}^{2}$ and $2 {cm}^{2}$ , as shown in the figure. A current of $20 A$ enters at $A$ . Then

Question Image

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JEE Main

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Chapterwise/Topicwise Daily Practice Problems (DPP) Electrostatics and Current Electricity JEE Main & Advanced>Chapter 5 - Electric Current and Circuits>DPP>Q 15

150 m

long metal wire connects points

A

and

B

. The electric potential at point

B

50 V

less than that at point

A

. If the conductivity of the metal is

60 \times 10^{6} mho m^{- 1}

, then the magnitude of the current density in the wire is equal to:

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Chapterwise/Topicwise Daily Practice Problems (DPP) Electrostatics and Current Electricity JEE Main & Advanced>Chapter 5 - Electric Current and Circuits>DPP>Q 1

First, a set of

n

equal resistors of

R

each is connected in series to a battery of emf

E

and internal resistance

R

. A current

I

is observed to flow. Then, the

n

resistors are connected in parallel to the same battery. It is observed that the current is increased

10

times. What is

n

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JEE Main

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Chapterwise/Topicwise Daily Practice Problems (DPP) Electrostatics and Current Electricity JEE Main & Advanced>Chapter 5 - Electric Current and Circuits>DPP>Q 2

Suppose there is a circuit consisting of only resistances and batteries. Suppose one is to double (or increase it to

n

times) all voltages and all resistances. Show that currents are unaltered.

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JEE Main

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Chapterwise/Topicwise Daily Practice Problems (DPP) Electrostatics and Current Electricity JEE Main & Advanced>Chapter 5 - Electric Current and Circuits>DPP>Q 3

Find the equivalent resistance between terminals $A$ and $B$ . Each resistor is of resistance $R$ .

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JEE Main

IMPORTANT

Chapterwise/Topicwise Daily Practice Problems (DPP) Electrostatics and Current Electricity JEE Main & Advanced>Chapter 5 - Electric Current and Circuits>DPP>Q 4

Find the equivalent resistance between $A$ and $B$ in the arrangement of resistances as shown.

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JEE Main

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Chapterwise/Topicwise Daily Practice Problems (DPP) Electrostatics and Current Electricity JEE Main & Advanced>Chapter 5 - Electric Current and Circuits>DPP>Q 5

The two ends of a uniform conductor are joined to a cell of emf

E

and some internal resistances. Starting from the midpoint

P

of the conductor, we move in the direction of current and return to

P

. The potential

V

at every point on the path is plotted against the distance covered

(x)

Which of the following graphs best represents the resulting curve?

A battery is connected to a uniform resistance wire AB and B is earthed. Which one of the graphs below shows how the current density J varies along AB?

Important Questions on Electric Current and Circuits

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A battery is connected to a uniform resistance wire $A B$ and $B$ is earthed. Which one of the graphs below shows how the current density $J$ varies along $A B$ ?