New Simplified Physics (Vol 1) For Class 12>Chapter 1 - Electric Charges and Field>Problems For Practice>Q 3

EASY

12th CBSE

IMPORTANT

Earn 100

Two equal positive charges, each of $2 μ C$ interact with a third positive charge of $3 μ C$ situated as shown in Fig. 1.32. Find the magnitude and direction of the force experienced by the charge of $3 μ C$ .

Important Questions on Electric Charges and Field

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 1 - Electric Charges and Field>Problems For Practice>Q 4

Four charges

+ q, + q, - q

and

- q

are placed respectively at the four corners

A, B, C

and

D

of a square of side

a

. Calculate the force on a charge

Q

placed at the centre of the square.

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 1 - Electric Charges and Field>Problems For Practice>Q 1

If an oil drop of weight

3 .2 \times 10^{- 13} N

is balanced in an electric field of

5 \times 10^{5} {Vm}^{- 1}

find the charge on the oil drop.

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 1 - Electric Charges and Field>Problems For Practice>Q 2

Calculate the magnitude of the electric field, which can just balance a deuteron of mass

3 .2 \times 10^{- 27} kg

. Take

g = 10 {ms}^{- 2}

.

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 1 - Electric Charges and Field>Problems For Practice>Q 3

A charged oil drop remains stationary when situated between two parallel plates

20 mm

apart and a p.d. of

500 V

is applied to the plates. Find the charge on the drop if it has a mass of

2 \times 10^{- 4} kg

. Take

g = 10 {ms}^{- 2}

.

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 1 - Electric Charges and Field>Problems For Practice>Q 4

In Millikan's experiment, an oil drop of radius

10^{- 4} cm

remains suspended between the plates which are

1 cm

apart. If the drop has charge of

5 e

over it, calculate the potential difference between the plates. The density of oil may be taken as

1 .5 {gcm}^{- 3}

.

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 1 - Electric Charges and Field>Problems For Practice>Q 5

A proton falls down through a distance of

2 cm

in a uniform electric field of magnitude

3 .34 \times 10^{3} {NC}^{- 1}

. Determine (i) the acceleration of the proton (ii) the time taken by the proton to fall through the distance of

2 cm

, and (iii) the direction of the electric field. Mass of a proton is

1 .67 \times 10^{- 27} kg

.

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 1 - Electric Charges and Field>Problems For Practice>Q 6

A particle of mass

10^{- 3} kg

and charge

5 μ C

is thrown at a speed of

20 {ms}^{- 1}

against a uniform electric field of strength

2 \times 10^{5} {NC}^{- 1}

. How much distance will it travel before coming to rest momentarily?

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 1 - Electric Charges and Field>Problems For Practice>Q 1

An electron is separated from the proton through a distance of

0.53 Å

. Calculate the electric field at the location of the electron.