PHYSICS PART-1 TEXTBOOK FOR CLASS XII>Chapter 1 - Electric Charges and Fields>EXERCISES>Q 1.2

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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? ( $k = 9 \times 10^{9} {Nm}^{2} C^{- 2}$ )

Important Questions on Electric Charges and Fields

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IMPORTANT

PHYSICS PART-1 TEXTBOOK FOR CLASS XII>Chapter 1 - Electric Charges and Fields>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?

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PHYSICS PART-1 TEXTBOOK FOR CLASS XII>Chapter 1 - Electric Charges and Fields>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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PHYSICS PART-1 TEXTBOOK FOR CLASS XII>Chapter 1 - Electric Charges and Fields>EXERCISES>Q 1.4

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

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PHYSICS PART-1 TEXTBOOK FOR CLASS XII>Chapter 1 - Electric Charges and Fields>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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PHYSICS PART-1 TEXTBOOK FOR CLASS XII>Chapter 1 - Electric Charges and Fields>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.

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PHYSICS PART-1 TEXTBOOK FOR CLASS XII>Chapter 1 - Electric Charges and Fields>EXERCISES>Q 1.6

Four-point charges

q_{A} = 2 µ C, q_{B} = - 5 µ C, q_{C} = 2 µ C, and q_{D} = - 5 µ C

are located at the corners of a square

ABCD

of side

10 cm

. What is the force on a charge of

1 µ C

placed at the center of the square?

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PHYSICS PART-1 TEXTBOOK FOR CLASS XII>Chapter 1 - Electric Charges and Fields>EXERCISES>Q 1.7

An electrostatic field line is a continuous curve. That is, a field line cannot have sudden breaks. Why not?

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PHYSICS PART-1 TEXTBOOK FOR CLASS XII>Chapter 1 - Electric Charges and Fields>EXERCISES>Q 1.7

Explain why two field lines never cross each other at any point?