Two identical conducting balls A and B have positive charges q 1 and q 2 respectively but q 1 ≠ q 2 . The balls are brought together so that they touch each other and kept in thin original positions. The force between them is

greater than that before the balls touched

less than that before the balls touched

same as that before the balls touched

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12th West Bengal Board

IMPORTANT

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Which of the following figures, Fig. $2.119$ , cannot possibly represent electrostatic field lines?

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Important Questions on Interaction of Charged Particles, Electric Field and Potential

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12th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 2 - Interaction of Charged Particles, Electric Field and Potential>EXERCISE 2>Q 47

A hollow metal sphere of radius

5 cm

is charged, such that the potential on its surface is

10 V

. The potential at the centre of the sphere is -

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12th West Bengal Board

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A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 2 - Interaction of Charged Particles, Electric Field and Potential>EXERCISE 2>Q 48

A charged wire is bent in the form of a semicircular arc of radius

a

. If charge per unit length is

λ {cm}^{- 1}

, the electric field at the centre

O

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A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 2 - Interaction of Charged Particles, Electric Field and Potential>EXERCISE 2>Q 49

Two equal point charges are fixed at

x = + a

and

x = - a

on the

X

-axis. Another point charge

Q

is placed at the origin. The change in electric potential energy of

Q

when it is displaced by small distance

x

along the

X

-axis, is approximately proportional to

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12th West Bengal Board

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A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 2 - Interaction of Charged Particles, Electric Field and Potential>EXERCISE 2>Q 50

The electric potential

V

at any point

x, y, z

(all the coordinates are in metres) in space is given by

V = 4 x^{2}

. The electric field at the point

(1 m, 0, 2 m)

{voltmetre}^{- 1}

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12th West Bengal Board

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A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 2 - Interaction of Charged Particles, Electric Field and Potential>EXERCISE 2>Q 51

Two small spheres of masses

M_{1}

and

M_{2}

are suspended by weightless insulating threads of lengths

L_{1}

and

L_{2} .

The spheres carry charges

Q_{1}

and

Q_{2}

respectively. The spheres are suspended such that they are in level with one another and the threads are inclined to the vertical at angles of

θ_{1}

and

θ_{2}

as shown in Fig.

2.120

. Which one of the following conditions is essential, if

θ_{1} = θ_{2}

Question Image

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12th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 2 - Interaction of Charged Particles, Electric Field and Potential>EXERCISE 2>Q 52

Two identical conducting balls

A

and

B

have positive charges

q_{1}

and

q_{2}

respectively but

q_{1} \neq q_{2}

. The balls are brought together so that they touch each other and kept in thin original positions. The force between them is

EASY

12th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 2 - Interaction of Charged Particles, Electric Field and Potential>EXERCISE 2>Q 53

A conductor has given a charge

- 3 \times 10^{- 7} C

by transferring electrons. Mass increase (in

Kg

) of the conductor and the number of electrons added to the conductor are respectively.

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12th West Bengal Board

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A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 2 - Interaction of Charged Particles, Electric Field and Potential>EXERCISE 2>Q 54

A charge

Q

is placed at each of the opposite corners of a square. A charge

q

is placed at each of the other two corners. If the net electrical force on

Q

is zero, then the

\frac{Q}{q}

equals

Which of the following figures, Fig. 2.119, cannot possibly represent electrostatic field lines?

Important Questions on Interaction of Charged Particles, Electric Field and Potential

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Which of the following figures, Fig. $2.119$ , cannot possibly represent electrostatic field lines?