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Physics Part-I

Electric Charges and Fields

A polythene piece rubbed with wool is found to have a negative

Physics Part-I

Class 12

NCERT

Chapter 1: Electric Charges and Fields

47 questions

An electric dipole with dipole moment

4 \times 1 0^{- 9}

C m is aligned at

3 0^{\circ}

with the direction of a uniform electric field of magnitude

5 \times 1 0^{4} N C^{- 1}

. Calculate the magnitude of the torque acting on the dipole.

A polythene piece rubbed with wool is found to have a negative charge of

3 \times 1 0^{- 7}

(a) Estimate the number of electrons transferred (from which to which?)

(b) Is there a transfer of mass from wool to polythene?

(a) Two insulated charged copper spheres A and B have their centres separated by a distance of 50 cm. What is the mutual force of 2021–22 Electric Charges and Fields 47 electrostatic repulsion if the charge on each is 6.5 × 10–7 C? The radii of A and B are negligible compared to the distance of separation. (b) What is the force of repulsion if each sphere is charged double the above amount, and the distance between them is halved?

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Question

Medium

Solving time: 4 mins

A polythene piece rubbed with wool is found to have a negative charge of $3 \times 1 0^{- 7}$ C.
(a) Estimate the number of electrons transferred (from which to which?)
(b) Is there a transfer of mass from wool to polythene?

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Updated on: Dec 5, 2023

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Physics Part-I (NCERT)

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A polythene piece rubbed with wool is found to have a negative charge of

3 \times 1 0^{- 7}

(a) Estimate the number of electrons transferred (from which to which?)

(b) Is there a transfer of mass from wool to polythene?

6 mins ago

Discuss this question LIVE

6 mins ago

Text solutionVerified

(a) Since negative charge is on polythene, electrons are transferred from wool to polythene. The no. of electrons transferred are

n = \frac{T o t a l c ha r g e}{e} = \frac{3 \times 1 0 ^{- 7}}{1.6 \times 1 0 ^{- 19}} = 1.87 \times 1 0^{12} \approx 2 \times 1 0^{12}

(b) The mass transferred is

m = n \times m_{e} = 2 \times 1 0^{12} \times 9.31 \times 1 0^{- 31} \approx 1.8 \times 1 0^{- 18} k g

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Practice more questions from Physics Part-I (NCERT)

An electric dipole with dipole moment

4 \times 1 0^{- 9}

C m is aligned at

3 0^{\circ}

with the direction of a uniform electric field of magnitude

5 \times 1 0^{4} N C^{- 1}

. Calculate the magnitude of the torque acting on the dipole.

A polythene piece rubbed with wool is found to have a negative charge of

3 \times 1 0^{- 7}

(a) Estimate the number of electrons transferred (from which to which?)

(b) Is there a transfer of mass from wool to polythene?

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Question Text	A polythene piece rubbed with wool is found to have a negative charge of $3 \times 1 0^{- 7}$ C. (a) Estimate the number of electrons transferred (from which to which?) (b) Is there a transfer of mass from wool to polythene?
Updated On	Dec 5, 2023
Topic	Electric Charges and Fields
Subject	Physics
Class	Class 12
Answer Type	Text solution:1 Video solution: 6
Upvotes	668
Avg. Video Duration	5 min

A polythene piece rubbed with wool is found to have a negative charge of $3 \times 1 0^{- 7}$ C.
(a) Estimate the number of electrons transferred (from which to which?)
(b) Is there a transfer of mass from wool to polythene?

Text solutionVerified

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A polythene piece rubbed with wool is found to have a negative charge of 3×10−7C.(a) Estimate the number of electrons transferred (from which to which?)(b) Is there a transfer of mass from wool to polythene?

Text solutionVerified

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A polythene piece rubbed with wool is found to have a negative charge of $3 \times 1 0^{- 7}$ C.
(a) Estimate the number of electrons transferred (from which to which?)
(b) Is there a transfer of mass from wool to polythene?