Core Science Physics>Chapter 3 - Electricity>Practice Problems : 3>Q 1

MEDIUM

10th CBSE

IMPORTANT

Earn 100

A resistance wire made from German silver has a resistance of $4 .25 Ω$ . Calculate the resistance of another wire, made from same material, such that its length increases by four times and area of cross-section decreases by three times.

Important Questions on Electricity

HARD

10th CBSE

IMPORTANT

Core Science Physics>Chapter 3 - Electricity>Practice Problems : 3>Q 2

A nichrome wire of length

l

and area of cross-section

\frac{a}{4}

has a resistance

R

. Another nichrome wire of length

3 l

and area of cross-section

\frac{a}{2}

has resistance of

R_{1}

. Find the ratio of

R_{1} : R

.

HARD

10th CBSE

IMPORTANT

Core Science Physics>Chapter 3 - Electricity>Practice Problems : 3>Q 3

A $4 Ω$ resistance wire is doubled on it. Calculate the new resistance of wire.

[Hint: On doubling: length becomes $1 / 2$ and area of cross-section becomes double]

MEDIUM

10th CBSE

IMPORTANT

Core Science Physics>Chapter 3 - Electricity>Practice Problems : 4>Q 1

Four resistors of

1 Ω, 2 Ω, 3 Ω

and

4 Ω

are connected in series. Calculate the resistance of the circuit.

EASY

10th CBSE

IMPORTANT

Core Science Physics>Chapter 3 - Electricity>Practice Problems : 4>Q 2

Resistors of

6 Ω, 5 Ω

and

9 Ω

are connected in series. Calculate the equivalent resistance (total resistance) of the circuit.

EASY

10th CBSE

IMPORTANT

Core Science Physics>Chapter 3 - Electricity>Practice Problems : 5>Q 1

Three resistors of

24 Ω, 12 Ω

and

8 Ω

are connected in parallel. Calculate the total resistance of the circuit.

EASY

10th CBSE

IMPORTANT

Core Science Physics>Chapter 3 - Electricity>Practice Problems : 5>Q 2

Four resistors of

24 Ω, 12 Ω, 8 Ω

and

4 Ω

are connected in parallel. Calculate the total resistance of the circuit.

MEDIUM

10th CBSE

IMPORTANT

Core Science Physics>Chapter 3 - Electricity>Practice Problems : 6>Q 1

What resistance should be added to two resistors of

8 Ω

and

5 Ω

in series respectively, such that equivalent resistance is

25 Ω

?

EASY

10th CBSE

IMPORTANT

Core Science Physics>Chapter 3 - Electricity>Practice Problems : 6>Q 2

Four resistors are connected in series such that equivalent resistance is

48 Ω

. If the resistance of three resistors is

5 Ω, 10 Ω

and

12 Ω

respectively, find the resistance of the fourth resistor.