New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>Problems For Practice>Q 1

EASY

12th CBSE

IMPORTANT

Earn 100

A voltage of $30 V$ is applied across a color-coded carbon resistor with first, second and third rings of blue, black and yellow colors. What is the current flowing through the resistor?

Important Questions on Current Electricity

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>Problems For Practice>Q 2

A potential difference of

10 V

is applied across a conductor of resistance

1 k Ω

. Find the number of electrons flowing through the conductor in

5

minutes.

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>Problems For Practice>Q 3

What length of a copper wire of cross-sectional area

0.01 {mm}^{2}

would be required to obtain a resistance of

1 k Ω

? The resistivity of copper

= 1.7 \times 10^{- 8} Ωm

.

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>Problems For Practice>Q 4

A metal wire of specific resistance

64 \times 10^{- 8} Ωm

and length

1.98 m

has a resistance of

7 Ω

. Find its radius.

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>Problems For Practice>Q 5

Calculate the resistance of a

2 m

long nichrome wire of radius

0.321 mm

. Resistivity of nichrome is

15 \times 10^{- 6} Ωm

. If a potential difference of

10 V

is applied across this wire, what will be the current in the wire?

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>Problems For Practice>Q 6

An electron beam has an aperture of

1.0 {mm}^{2}

. A total of

6 \times 10^{16}

electrons flow through any perpendicular cross-section per second. Calculate (i) the current and (ii) the current density in the electron beam.

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>Problems For Practice>Q 7

Calculate the electric field in a copper wire of cross-sectional area

2.0 {mm}^{2}

carrying a current of

1 A

. The resistivity of copper

= 1.7 \times 10^{- 8} Ωm

.

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>Problems For Practice>Q 8

A given copper wire is stretched to reduce its diameter to half its previous value. What would be its new resistance?

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>Problems For Practice>Q 9

What will be the change in resistance of a constantan wire when its radius is made half and length reduced to one-fourth of its original length?