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Electrostats

Electrostats - Physics Questions asked by Filo students

Question 61

5. Two electric charges

q

and

2 q

are at a distance

a

apart from each other in air. A third charge

Q

is to be placed along the same line in such a way that the net force acting at

q

and also at

2 q

is zero. Calculate the position of charge

Q

in terms of

q

and

a

Topic:

Electrostats

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Question 62

The cause of quantization of electric charge is

transfer of electrons
transfer of protons
transfer of integral number of electrons
none of the above

Topic:

Electrostats

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Question 63

A solid non-conducting sphere of radius

R

carries a non-uniform charge distribution with charge density

ρ = ρ_{s} (r / R)

, where

ρ_{s}

is a constant. Show that (a) the total charge on the sphere is

Q = π ρ_{5} R^{3}

, and (b) the electric field inside the sphere is given by

E = \frac{1}{4 πi n _{0}} \frac{Q}{R ^{4}} r^{2}

Topic:

Electrostats

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Question 64

Ipp-o5 (1) uniformly charged sphere carries a

d

tetal charges of

2 π \times 1 0^{- 12} C

. It radui is is

5 cm

and is placed in vaccum. Detemine its siroface charge density. Ans

2 \times 1 0^{- 10} cm^{- 2}

Topic:

Electrostats

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Question 65

Two point charges

Q

and

- 3 Q

are placed at some distance apari. If the electrie field at the location of

Q

E

, the field at the location of

- 3 Q

$o v err i g h t a rro w E$
$- o v err i g h t a rro w E$
$+ \frac{o v err i g h t a rro w E}{3}$
$- \frac{v ec E}{3}$

Topic:

Electrostats

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Question 66

Across a metallic conductor of non-uniform cross section a constant potential difference is applied. The quantity which remains constant along the conductor is :

current
drift velocity
electric field
current density

Topic:

Electrostats

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Question 67

The value of effective resistance between

A

and

B

is ?

(R = 2 k Ω)

$(1 + 3) k Ω$
$2 (1 + 3) k Ω$
$(1 - 3) k Ω$
$2 (1 - 3) k Ω$

Topic:

Electrostats

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Question 68

8. In the given circuit, a charge of

+ 80 m u C

is given to the upper plate of the

4 m u F

capacitor. Then in the steady state, the charge on the upper plate of the

3 m u F

capacitor is : [IIT-JEE-2012, Paper-2; 3/66, -1]

Topic:

Electrostats

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Question 69

Comprehension Based A point charge

q_{1} = + 6 e

fixed at the origin of a coordinate system and another point charge

q_{2} = - 10 e

is fixed at

x = 8 nm, y = 0

. The locus of all points in the

x y

plane for which potential

V = 0

(other than infinity) is a circle centered on the

x

-axis, as shown 12. Radius

R

of the circle is

$3 nm$
$6 nm$
$7.5 nm$
$9 nm$

Topic:

Electrostats

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Question 70

x

-coordinate of the centre of the circle is

$- 2 nm$
$- 3 nm$
$- 4.5 nm$
$- 7.5 nm$

Topic:

Electrostats

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Question 71

The potential at the centre of the circle is

$0.32 V$
$0.77 V$
$1.2 V$
$- 1.2 V$

Topic:

Electrostats

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Question 72

Comprehension Based A point charge

q_{1} = + 6 e

fixed at the origin of a coordinate system, and another point charge

q_{2} = - 10 e

is fixed at

x = 8 nm, y = 0

. The locus of all points in the

x y

plane for which potential

V = 0

(other than infinity) is a circle centered on the

x

-axis, as shown. 12. Radius

R

of the circle is

$3 nm$
$6 nm$
$7.5 nm$
$9 nm$

Topic:

Electrostats

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Question 73

x

-coordinate of the centre of the circle is

$- 2 nm$
$- 3 nm$
$- 4.5 nm$
$- 7.5 nm$

Topic:

Electrostats

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Question 74

The potential at the centre of the circle is

$0.32 V$
$0.77 V$
$1.2 V$
$- 1.2 V$

Topic:

Electrostats

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Question 75

4. Figure shows a charged rod, bent in the form of an arc of a circle. The charge distribution on the rod is shown in figure. The assembly is kept in a uniform electric field. (a) Find the dipole moment of the rod. (b) For small angular displacement the system find the time period of oscillation of the system.

Topic:

Electrostats

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Question 76

Q.5 The cross-sectional area of the conductor

R

a

and

b

in the given circuit are in the ratio

1 : 2

. If the circuit current is

0.5 A

, then the ratio of the number of electrons flowing through sections at

a

and

b

per second will be [2014]

$1 : 1$
$1 : 2$
$1 : 4$
$1 : 16$

Topic:

Electrostats

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Question 77

Funeeren [HCERT]

Topic:

Electrostats

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Question 78

Q.5 The cross-sectional area of the conductor

R

a

and

b

in the given circuit are in the ratio

1 : 2

. If the circuit current is

0.5 A

, then the ratio of the number of electrons flowing through sections at

a

and

b

per second will be [2014

$1 : 1$
$1 : 2$
$1 : 4$
$1 : 16$

Topic:

Electrostats

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Question 79

The radiation emitted by a star A is 1000 times that of the sun. If the surface temperatures of the sun and star A are

6000 K

and

2000 K

respectively, the ratio of the radii of the star A and the sun is

$300 : 2$
$600 : 1$
$300 : 1$
$1200 : 1$

Topic:

Electrostats

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Question 80

The density of copper is

9 \times 1 0^{3} kg / m^{3}

and its atomic mass

14.

63.5 u

. Each copper atom provides one free electron. Estimate the number of free electrons per cubic meter in copper.

$1 0^{19}$
$1 0^{23}$
$1 0^{25}$
$1 0^{29}$

Topic:

Electrostats

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Electrostats - Physics Questions asked by Filo students

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