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Two cells, having the same e.m.f. are connected in series through an external resistance $R$ . Cells have internal resistances $r_{1}$ and $r_{2} (r_{1} > r_{2})$ respectively. When the circuit is closed, the potential difference across the first cell is zero. The value of $R$ is

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Important Questions on Current Electricity

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12th Uttar Pradesh Board

IMPORTANT

Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 3 - Current Electricity>Exercise>Q 26

A group of

N

cells, whose emf varies directly with the internal resistance as per the equation

E_{N} = 1.5 r_{N}

, are connected as shown in the figure. The current

I

in the circuit is

Question Image

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12th Uttar Pradesh Board

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Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 3 - Current Electricity>Exercise>Q 27

Two similar cells, whether joined in series or in parallel, have the same current through an external resistance of

2 Ω

. The internal resistance of each cell is

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12th Uttar Pradesh Board

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Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 3 - Current Electricity>Exercise>Q 28

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

1.5 Ω

. Find the value of internal resistance of each cell.

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12th Uttar Pradesh Board

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Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 3 - Current Electricity>Exercise>Q 29

A battery consists of a variable number (

n

) of identical cells, each having an internal resistance

r

connected in series. The terminal of the battery is short-circuited. A graph of current versus the number of cells will be as shown in figure.

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12th Uttar Pradesh Board

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Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 3 - Current Electricity>Exercise>Q 30

In the electric circuit shown, each cell has an emf of

2 V

and internal resistance of

1 Ω

. The external resistance is

2 Ω

. The value of the current

I

is (in ampere)

Question Image

HARD

12th Uttar Pradesh Board

IMPORTANT

Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 3 - Current Electricity>Exercise>Q 31

n

identical cells each of emf

E

and internal resistance

r

are connected in series to form a row. m such rows are connected in parallel to form a battery of

N = mn

cells. This battery is connected to an external resistance

R

(i)

What is the emf of this battery and how much is its internal resistance?

HARD

12th Uttar Pradesh Board

IMPORTANT

Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 3 - Current Electricity>Exercise>Q 32

n

Cells each of emf

E

and internal resistance

r

are connected in series to form a row. m such rows are connected in parallel to form a battery of

N = mn

Cells. This battery is connected to an external resistance:

R

. Show that current

I

flowing through the external resistance

R

is given by

I = \frac{N_{e}}{mR + nr}

HARD

12th Uttar Pradesh Board

IMPORTANT

Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 3 - Current Electricity>Exercise>Q 33

n

identical cells, each of emf E and internal resistance

r

, are connected in series to a resistor

R

. Deduce an expression for the internal resistance

r

of one cell in terms of the current

I

in the circuit.

Two cells, having the same e.m.f. are connected in series through an external resistance R . Cells have internal resistances r1 and r2 r1>r2 respectively. When the circuit is closed, the potential difference across the first cell is zero. The value of R is

Important Questions on Current Electricity

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Two cells, having the same e.m.f. are connected in series through an external resistance $R$ . Cells have internal resistances $r_{1}$ and $r_{2} (r_{1} > r_{2})$ respectively. When the circuit is closed, the potential difference across the first cell is zero. The value of $R$ is