HARD

12th ICSE

IMPORTANT

Earn 100

Two cells $E_{1}$ and $E_{2}$ of emf's $4 V$ and $2 V$ respectively, each having an internal resistance of $2 Ω$ send current in an external resistance of $8 Ω$ . Find the magnitudes and the directions of currents $I_{1}$ and $I_{2}$ flowing through the cells $E_{1}$ and $E_{2}$ .

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 34

Two cells of emf's

6 V

and

12 V

and internal resistances

1 Ω

and

2 Ω

respectively are connected in parallel to send current in the same direction through an external resistance of

15 Ω

. Draw the circuit diagram. Using Kirchoff's laws, calculate the current through each branch of the circuit and p.d. across the

15 Ω

resistance.

HARD

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 6 - DC Circuits and Measurements>QUESTIONS>Q 35

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.

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?

Two cells E1 and E2 of emf's 4 V and 2 V respectively, each having an internal resistance of 2Ω send current in an external resistance of 8Ω. Find the magnitudes and the directions of currents I1 and I2 flowing through the cells E1 and E2.

Important Questions on DC Circuits and Measurements

Learn and Prepare for any exam you want !

Two cells $E_{1}$ and $E_{2}$ of emf's $4 V$ and $2 V$ respectively, each having an internal resistance of $2 Ω$ send current in an external resistance of $8 Ω$ . Find the magnitudes and the directions of currents $I_{1}$ and $I_{2}$ flowing through the cells $E_{1}$ and $E_{2}$ .