A part of an electric circuit is shown in the figure below : Using Kirchhoff's 2 nd law, find the current I flowing through the 4 Ω resistor.

In the question we are given with the circuit in which there are three resistance, in order to solve such types of the circuit use Kirchhoff's Law. According to Kirchhoff's voltage law ∑ V = 0 in a closed loop. By using the law we can directly find the current through 4 ohm resistors. So, in loop ABCA by using this law 3 × 2 + 4 I - 6 × 2 = 0 ⇒ I = 12 - 6 4 = 6 4 = 3 2 ⇒ I = 1 . 5 A

E M B I B E

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 6 - DC Circuits and Measurements>QUESTIONS>Q 17

EASY

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IMPORTANT

Earn 100

The figure show parts of electrical circuits. Compute $I$ in each case.

Important Questions on DC Circuits and Measurements

MEDIUM

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 6 - DC Circuits and Measurements>QUESTIONS>Q 17

The figure show parts of electrical circuits. Compute $I$ in each case.

Question Image

HARD

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IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 6 - DC Circuits and Measurements>QUESTIONS>Q 18

A wire of uniform cross-section and length

l

has a resistance of

16 Ω

. It is cut into four equal parts. Each part is stretched uniformly to length / and all the four stretched parts are connected in parallel. Calculate the total resistance of this combination.

HARD

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IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 6 - DC Circuits and Measurements>QUESTIONS>Q 19

A

4 Ω

resistance wire is bent in the form of a circle. Find the effective resistance between the ends of a diameter.

MEDIUM

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IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 6 - DC Circuits and Measurements>QUESTIONS>Q 20

The figure shows the variation of potential difference $V$ with length $l$ of the wire for two potentiometers $X$ and $Y$ . Which one will you prefer for comparing emfs of two cells and why?

Question Image

MEDIUM

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 6 - DC Circuits and Measurements>QUESTIONS>Q 21

A part of an electric circuit is shown in the figure below :

Question Image

Using Kirchhoff's $2 nd$ law, find the current $I$ flowing through the $4 Ω$ resistor.

EASY

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IMPORTANT

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

Does emf of a cell represent a force or potential energy or work done per unit charge? When will it be equal to the PD across the terminals of the cell?

EASY

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IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 6 - DC Circuits and Measurements>QUESTIONS>Q 2

Is the direction of emf in a cell dependent on the direction of current within the cell?

EASY

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IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 6 - DC Circuits and Measurements>QUESTIONS>Q 3

What is internal resistance of a cell? On what factors does it depend?