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Electrostats - Physics Questions asked by Filo students

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8. Consider the situation shown in figure (31-E31). The plates of the capacitor have plate area

A

and are clamped in the laboratory. The dielectric slab is released from rest with a length

a

inside the capacitor. Neglecting any effect of friction or gravity, show that the slab will execute periodic motion and find its time period.

Topic:

Electrostats

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A metallic solid is placed in a uniform electric field. The lines of force follow the path(s) shown in the figure as:

1
2
3
4

Topic:

Electrostats

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A capacitor is made of two square plates each of side

^{p r im e}

making a very small angle

α

between them, as shown in figure. The capacitance will be close to:

l e f t (1 + \frac{α a}{d} i g h t)

$\frac{ϵ _{0} a ^{2}}{d} l e f t (1 - \frac{3 α a}{2 d} i g h t)$

Topic:

Electrostats

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Views: 5,741

A capacitor is made of two square plates each of side

^{p r im e}

making a very small angle

α

between them, as shown in figure. The capacitance will be close to:

l e f t (1 + \frac{α a}{d} i g h t)

$\frac{ϵ _{0} a ^{2}}{d} l e f t (1 - \frac{3 α a}{2 d} i g h t)$

Topic:

Electrostats

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Views: 5,882

3.0 V

is connected to a resistor dissipating

0.5 W

of power. If the terminal voltage of the battery is

2.5 V

, the power dissipated within the internal resistance is :

Topic:

Electrostats

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Views: 5,836

When a negatively charged rod is brought near the cap of a gold leaf electroscope whose case is earthed, then

Leaves will have induced positive charge
Positive charge is induced on one leaf and negative on the other
No charge is induced on the leaves
The leaf has an induced negative charge

Topic:

Electrostats

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Views: 5,202

2. What is the electric flux through a cube of side

1 cm

which encloses an electric dipole? All india 2015

Topic:

Electrostats

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Views: 5,044

A cubical Gaussian surface encloses a spherical conductor at its centre. If the conductor carries a charge of 24 C, the TNEI over any one face of the cube is

greater than $4 C$
equal to $4 C$
less than 4 C
greater than, equal to or less than $4 C$ .

Topic:

Electrostats

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Views: 5,964

A cubical Gaussian surface encloses a spherical conductor at its centre. If the conductor carries a charge of 24 C, the TNEI over any one face of the cube is

greater than $4 C$
equal to $4 C$
less than $4 d o t C$
greater than, equal to or less than $4 C$ .

Topic:

Electrostats

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Question 10

Views: 5,702

U = - 8 \times cos 6 0^{\circ} = - 4

J Q.3. Find the expression for electric field intensity in an axial position due to electric dipole.

Topic:

Electrostats

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Question 11

Views: 5,045

Electric field at a distance

r

from infinitely long conducting sheet is proportional to

$r^{- 1}$
$r^{- 2}$
$r^{- 3/2}$
$r^{0}$

Topic:

Electrostats

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Question 12

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56. The equivalent capacity between points

A

B

Topic:

Electrostats

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Question 13

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8. Four charges are placed at the vertices of a square of side

d

as shown in the figure.(i) Find the work done to put together this arrangement. (ii) A charge qois brought to the center E of the square, the four charges being held fixed at its corners. How much extra work is needed to do this?

Topic:

Electrostats

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Question 14

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4. Two metal spheres, one of radius

R

and the other of radius

2 R

respectively have the same surface charge density

σ

. They are brought in contact and separated. What will be the new surface charge densities on them ? (a)

σ_{1} = \frac{5}{6} σ, σ_{2} = \frac{5}{2} σ

Topic:

Electrostats

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Question 15

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Example 1.7 Two identical spheres having positive charges are placed

3 m

apart repel each other with a force

8 \times 1 0^{- 3} N

. Now, charges are connected by a metallic wire, they begin to repel each other with a force of

9 \times 1 0^{- 3} N

. Find initial charges on the spheres.

Topic:

Electrostats

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Question 16

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1.7

Two identical spheres having positive charges are placed

3 m

apart repel each other with a force

8 \times 1 0^{- 3} N

. Now, charges are connected by a metallic wire, they begin to repel each other with a force of

9 \times 1 0^{- 3} N

. Find initial charges on the spheres. Sol. Let charges are

a_{3}

a_{2}

3 m

apart from each other.

Topic:

Electrostats

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Question 17

Views: 5,067

The angular speed of Flywheel just after mass

m

$10 rad / s$
$5 rad / s$
$15 rad / s$
none of these

Topic:

Electrostats

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Question 18

Views: 5,326

The work done by the friction in each revolution is

$37.5$ joule/cycle
$40.5$ joule /cycle
$12.5$ joule/cycle
50 joule/cycle

Topic:

Electrostats

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Question 19

Views: 5,642

The linear velocity of mass

m

just before it is detached is

$0.0625 m / s$
$2.5 m / s$
$5 m / s$
$12.5 m / s$

Topic:

Electrostats

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Question 20

Views: 5,844

With what acceleration should the vessel be accelerated to have zero tension in

A B

vertically upward with acceleration $g$
vertically downward with acceleration $g$
at an angle of $4 5^{\circ}$ with $A B$ with acceleration $g$ (D) it is not possible to have zero tension in $A E$

Topic:

Electrostats

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