Potential difference across a potentiometer wire of length 4 m is 2 V . Calculate the potential gradient of the potentiometer.

Given: V = 2 v , l = 4 m To find: K As we know that Potential gradient is potential per unit length K = V l = 2 4 = 0 .5 V / m K = 0 . 5 V m

HARD

12th ICSE

IMPORTANT

Earn 100

Two cells $A$ and $B$ , each having emf $1.5 V$ and internal resistances $1.5 Ω$ and $0.5 Ω$ respectively, are joined in parallel with a $1.0 Ω$ resistor. Calculate currents drawn from the cells and their terminal PD’s.

Important Questions on DC Circuits and Measurements

HARD

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 6 - DC Circuits and Measurements>QUESTIONS>Q 36

Three identical cells, each of emf

2 V

and unknown internal resistance are connected in parallel. This combination is connected to a

6 Ω

resistor. The terminal potential difference across each cell is

1.5 V

. What is the internal resistance of each cell?

MEDIUM

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 6 - DC Circuits and Measurements>QUESTIONS>Q 37

Calculate the currents $I_{1}, I_{2}$ and $I_{3}$ in the given The cells have negligible internal resistances.

Question Image

HARD

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 6 - DC Circuits and Measurements>QUESTIONS>Q 38

In determining the resistance of a given wire with the help of metre bridge, the null-point is obtained at a distance of

40 cm

on taking out

2 Ω

resistance from the resistance box. What is the resistance of the wire? To obtain the null-point at a distance of

60 cm

, how much resistance in ohm, will have to be taken out from the resistance box?

HARD

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 6 - DC Circuits and Measurements>QUESTIONS>Q 39

In figure, $A B$ is a potentiometer wire of length $100 cm$ . The cell of emf $3 V$ has a negligible internal resistance. What is the reading in voltmeter $V$ , if $BC$ is equal to $70 cm$ ?

Question Image

HARD

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 6 - DC Circuits and Measurements>QUESTIONS>Q 40

3 V

battery of internal resistance

1 Ω

is joined to a sliding wire of length

100 cm

and resistance

5 Ω

. A voltmeter, which takes negligible current, is connected across

60 cm

length of the wire, What is the reading of the voltmeter?

MEDIUM

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 6 - DC Circuits and Measurements>QUESTIONS>Q 40

3 V

battery of internal resistance

1 Ω

is joined to a sliding wire of length

100 cm

and resistance

5 Ω

. A voltmeter, which takes negligible current, is connected across

60 cm

length of the wire, if the resistance of the voltmeter were

150 Ω

, then what would have its reading?

EASY

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 6 - DC Circuits and Measurements>QUESTIONS>Q 41

Potential difference across a potentiometer wire of length

4 m

2 V

. Calculate the potential gradient of the potentiometer.

EASY

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 6 - DC Circuits and Measurements>QUESTIONS>Q 42

10 m

long potentiometer wire has a potential gradient of

0.0025 V / cm

along its length. Calculate the length of the wire at which null-point is obtained for a

1.025 V

standard cell. Also, find the emf of another cell for which the null-point is obtained at

860 cm

length. What maximum PD can be measured by this potentiometer?

Two cells A and B, each having emf 1.5 V and internal resistances 1.5 Ω and 0.5 Ω respectively, are joined in parallel with a 1.0 Ω resistor. Calculate currents drawn from the cells and their terminal PD’s.

Important Questions on DC Circuits and Measurements

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Two cells $A$ and $B$ , each having emf $1.5 V$ and internal resistances $1.5 Ω$ and $0.5 Ω$ respectively, are joined in parallel with a $1.0 Ω$ resistor. Calculate currents drawn from the cells and their terminal PD’s.