EASY

JEE Main

IMPORTANT

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A null point is found at $200 cm$ in potentiometer when cell in secondary circuit is shunted by $5 Ω$ . When a resistance of $15 Ω$ is used for shunting null point moves to $300 cm$ . The internal resistance of the cell is ______ $Ω$ .

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Important Questions on Current Electricity

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 14 - Current Electricity>JEE Main - 30 January 2023 Shift 2>Q 147

If the potential difference between $B$ and $D$ is zero, the value of $x$ is $\frac{1}{n} Ω$ . The value of $n$ is ______.

Question Image

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 14 - Current Electricity>JEE Main - 31 January 2023 Shift 1>Q 150

Two identical cells, when connected either in parallel or in series gives same current in an external resistance

5 Ω

. The internal resistance of each cell will be ______

Ω

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 14 - Current Electricity>JEE Main - 1 February 2023 Shift 1>Q 153

The equivalent resistance between $A a n d B$ of the network shown in figure:

Question Image

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 14 - Current Electricity>JEE Main - 1 February 2023 Shift 1>Q 154

In an experiment to find emf of a cell using potentiometer, the length of null point for a cell of emf

1.5 V

is found to be

60 cm

. If this cell is replaced by another cell of emf

E

. the length-of null point increases by

40 cm

. The value of

E

\frac{x}{10} V

. The value of

x

is ______.

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 14 - Current Electricity>JEE Main - 26 August 2021 Shift 1>Q 2

What equal length of an iron wire and a copper-nickel alloy wire, each of

2 mm

diameter connected parallel to give an equivalent resistance of

3 Ω

?
(Given resistivities of iron and copper-nickel alloy wire are

12 μΩ cm

and

51 μΩ cm

respectively)

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 14 - Current Electricity>JEE Main - 26 August 2021 Shift 2>Q 3

An electric bulb of

500 W

100 V

is used in a circuit having a

200 V

supply. Calculate the resistance

R

to be connected in series with the bulb so that the power delivered by the bulb is

500 W

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 14 - Current Electricity>JEE Main - 27 August 2021 Shift 1>Q 7

First, a set of

n

equal resistors of

10 Ω

each are connected in series to a battery of E.M.F.

20 V

and internal resistance

10 Ω .

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

20

times, then the value of

n

is ___________.

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 14 - Current Electricity>JEE Main - 27 August 2021 Shift 2>Q 8

For full scale deflection of total

50

divisions,

50 mV

voltage is required in galvanometer. The resistance of galvanometer if its current sensitivity is

2 div / mA

will be:

A null point is found at 200 cm in potentiometer when cell in secondary circuit is shunted by 5 Ω. When a resistance of 15 Ω is used for shunting null point moves to 300 cm. The internal resistance of the cell is ______ Ω.

Important Questions on Current Electricity

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A null point is found at $200 cm$ in potentiometer when cell in secondary circuit is shunted by $5 Ω$ . When a resistance of $15 Ω$ is used for shunting null point moves to $300 cm$ . The internal resistance of the cell is ______ $Ω$ .