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Electrostats

Solution for Class 12, Physics, Electrostats

Question 41

An electron completes 25 rotations in 1 seconds on circular path, then amount of electric charge passing through any point in circular path in 10 seconds is

$4 \times 1 0^{20} C$
$4 \times 1 0^{- 19} C$
$4 \times 1 0^{- 18} C$
$4 \times 1 0^{- 17} C$

Topic:

Electrostats

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Question 42

n the drop will be

$3.3 \times 1 0^{- 18} C$
$3.2 \times 1 0^{- 18} C$

Topic:

Electrostats

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Question 43

A particle of mass

3.3 \times 1 0^{- 18} C^{- 18} C q u a d

3.2 \times 1.6 \times 1 0^{- 18} C

$4.8 \times 1 0^{- 18} C$

Topic:

Electrostats

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Question 44

A particle of mass

m

and charge

q

is placed at rest in a uniform electric field

E

and then released. The

K

. E. attained by the particle after moving a distance

y

$qEy^{2}$
$qE^{2} y$
$qEy$
$q^{2} Ey$

Topic:

Electrostats

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Question 45

Example 1.4 Coulombs law for electrostatic force between two point charges and Newtons law for gravitational force between two stationary point masses, both have inverse-square dependence on the distance between the charges and masses respectively. (a) Compare the strength of these forces by determining the ratio of their magnitudes (i) for an electron and a proton and (ii) for two protons. (b) Estimate the accelerations of electron and proton due to the electrical force of their mutual attraction when they are

1 AA l e f t (= 1 0^{- 10} m i g h t)

apart?

l e f t (m_{p} = 1.67 \times 1 0^{- 27} kg, m_{e} = 9.11 \times 1 0^{- 31} kg i g h t)

Topic:

Electrostats

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Question 46

A milivoltmeter of 25 milivolts range is to be converted into an ammeter of 25 amperes range. The value (in ohms) of necessary shunt will be :

1
$0.05$
$0.001$
$0.01$

Topic:

Electrostats

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Question 47

A cell having an emf

v a re p s i l o n

and internal resistance

r

is connected across a variable external resistance

R

. As the resistance

R

is increased, the plot of potential difference

V

across

R

is given by :-

Topic:

Electrostats

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Question 48

Select the correct statement:

The electric lines of force are always closed curves
Electric line of force is parallel to equipotential surface
Electric line of force is perpendicular to equipotential surface
Electric line of force is always the path of a positively charged particle.

Topic:

Electrostats

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Question 49

30. A particle

A

having a charge of

2.0 \times 1 0^{- 6} C

and a mass of

100 g

is placed at the bottom of a smooth inclined plane of inclination

3 0^{\circ}

. Where should another particle

B

, having same charge and mass, be placed on the incline so that it may remain in equilibrium?

Topic:

Electrostats

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Question 50

Dipole moment of the given system of point charges is

$25 q a$
$35 q a$
$5 q a$
209

Topic:

Electrostats

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Question 51

In the shown figure, the current

i

in circuit is

Topic:

Electrostats

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Question 52

4. In the shown figure, the current

i

in circuit is

Topic:

Electrostats

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Question 53

In the following circuit the potential difference between

A

and

Bl e f t (V_{B} - V_{A} i g h t)

$10 V$
$5 V$
$15 V$
$7.5 V$

Topic:

Electrostats

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Question 54

All India 2010 33. State Kirchhoffs rules. Apply these rules to the loops

PRSP

and

PRQP

to write the expressions for the currents

I_{1}, I_{2}

and

I_{3}

in given circuit. All India 2010

Topic:

Electrostats

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Question 55

When the short circuit condition occurs, the current in the circuit

becomes zero
remains constant
increases substantially
keeps on changing randomly

Topic:

Electrostats

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Question 56

When the short circuit condition occurs, the current in the circuit

becomes zero
remains constant
increases substantially
keeps on changing randomly

Topic:

Electrostats

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Question 57

5. Two positively charged particles each of mass

1.7 \times 1 0^{- 27} Kg

, carrying a charge of

1.6 \times 1 0^{- 19} C

are kept at a certain distance in air. If each charge experiences a repulsive force equal to its weight, find the distance of separation between the charges. (A) [0.117m]

Topic:

Electrostats

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Question 58

88. If engine of train produce hom at B point then find apparent frequency observed by observer at A Sol.: Ans.

680 Hz

Topic:

Electrostats

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Question 59

R_{1}, R_{2}, R_{3}

are different values of

R . A, B

and

C

are the null points obtained corresponding to

R_{1}, R_{2}

and

R_{3}

respectively. For which resistor, the value of

X

will be the most accurate and why?

Topic:

Electrostats

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Question 60

1. Two small, identical metallic spheres

A

and

B

, each carrying a charge

q

; repel each other with a force

F

A third uncharged metallic sphere

C

of the same size is successively made to touch the spheres

A

and

B

and then removed away. What is the new force of repulsion between

A

and

B

Topic:

Electrostats

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Solution for Class 12, Physics, Electrostats

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