What is the force between two small charged sphere having charges of 2 × 10 - 7 C and 3 × 10 - 7 C placed 30 cm apart in air? ( k = 9 × 10 9 Nm 2 C - 2 )

Given, Charge on the first sphere, q 1 = 2 × 10 - 7 C Charge on the second sphere, q 2 = 3 × 10 - 7 C Distance between the spheres is, r = 30 c m = 0.3 m The proportionality constant, k = 9 × 10 9 Nm 2 C - 2 Now, from the coulomb's law, force F = k q 1 q 2 r 2 = 9 × 10 9 × 2 × 10 - 7 × 3 × 10 - 7 ( 0 .3 ) 2 = 6 × 10 - 3 N

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A charge $Q$ is distributed uniformly on a ring of radius $r$ . A sphere of equal radius $r$ is constructed with its centre at the periphery of the ring, Find the electric flux through the sphere.

Important Questions on Electric Charges and Field

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New Simplified Physics (Vol 1) For Class 12>Chapter 1 - Electric Charges and Field>HOTS Problems on Higher Order Thinking Skills>Q 29

An early model of an atom considered it to have a positively charged point nucleus of charge

Z e

, surrounded

(r > R)

by a uniform density of negative charge up to a radius

R

. The atom as a whole is neutral. For this model, what is the electric field at a distance

r

from the nucleus?

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12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 1 - Electric Charges and Field>GUIDELINES TO NCERT EXERCISES>Q 1.1.

What is the force between two small charged sphere having charges of

2 \times 10^{- 7} C

and

3 \times 10^{- 7} C

placed

30 cm

apart in air? (

k = 9 \times 10^{9} {Nm}^{2} C^{- 2}

)

MEDIUM

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 1 - Electric Charges and Field>GUIDELINES TO NCERT EXERCISES>Q 1.2.

The electrostatic force on a small sphere of charge

0.4 µ C

due to another small sphere of charge

- 0.8 µ C

in the air is

0.2 N .

What is the distance between the two spheres? (

k = 9 \times 10^{9} {Nm}^{2} C^{- 2}

)

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 1 - Electric Charges and Field>GUIDELINES TO NCERT EXERCISES>Q 1.2.

The electrostatic force on a small sphere of charge

0.4 µ C

due to another small sphere of charge

- 0.8 µ C

in the air is

0.2 N .

What is the force on the second sphere due to the first?

MEDIUM

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 1 - Electric Charges and Field>GUIDELINES TO NCERT EXERCISES>Q 1.3.

Check that the ratio

k e^{2} / G m_{e} m_{p}

is dimensionless. Look up a table of physical constants and determine the value of this ratio. What does the ratio signify?

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New Simplified Physics (Vol 1) For Class 12>Chapter 1 - Electric Charges and Field>GUIDELINES TO NCERT EXERCISES>Q 1.4.

Explain the meaning of the statement ‘electric charge of a body is quantized’.

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 1 - Electric Charges and Field>GUIDELINES TO NCERT EXERCISES>Q 1.4.

Why can one ignore the quantization of electric charge when dealing with macroscopic i.e., large-scale charges?

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12th CBSE

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New Simplified Physics (Vol 1) For Class 12>Chapter 1 - Electric Charges and Field>GUIDELINES TO NCERT EXERCISES>Q 1.5.

When a glass rod is rubbed with a silk cloth, charges appear on both. A similar phenomenon is observed with many other pairs of bodies. Explain how this observation is consistent with the law of conservation of charge.

A charge Q is distributed uniformly on a ring of radius r. A sphere of equal radius r is constructed with its centre at the periphery of the ring, Find the electric flux through the sphere.

Important Questions on Electric Charges and Field

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A charge $Q$ is distributed uniformly on a ring of radius $r$ . A sphere of equal radius $r$ is constructed with its centre at the periphery of the ring, Find the electric flux through the sphere.