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Four charges are placed at the circumference of a dial clock and one in middle as shown in the figure. The direction of net force of the given four charges on the middle one will point as if it is _________ in the clock.

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Important Questions on Physics

EASY

General Knowledge>General Science>Physics>Electricity

The bob of a simple pendulum has mass

2 g

and a charge of

5.0 μ C .

It is at rest in a uniform horizontal electric field of intensity

2000 V / m

At equilibrium, the angle that the pendulum makes with the vertical is:

(t a k e g = 10 m / s^{2})

EASY

General Knowledge>General Science>Physics>Electricity

Suppose the charge of a proton and an electron differ slightly. One of them is

e

, the other is

(e + Δ e)

. If the net electrostatic force and gravitational force between two hydrogen atoms placed at a distance

d

(much greater than atomic size) apart is zero, then

Δ e

is of the order of [Given mass of hydrogen

m_{h} = 1.67 \times 10^{- 27} kg

]

EASY

General Knowledge>General Science>Physics>Electricity

The flow of _____ is anti–clockwise in the given circuit:

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MEDIUM

General Knowledge>General Science>Physics>Electricity

A simple pendulum of length

L

is placed between the plates of a parallel plate capacitor having electric field

E

, as shown in figure. Its bob has mass

m

and charge

q

. The time period of the pendulum is given by:
Question Image

EASY

General Knowledge>General Science>Physics>Electricity

Two metal wires of identical dimensions are connected in series. If

v_{1}

and

v_{2}

are the conductivities of the metal wires respectively, the effective conductivity if the combination is:

EASY

General Knowledge>General Science>Physics>Electricity

A wire of resistance

R

is bent to form a square

A B C D

as shown in the figure. The effective resistance between

E

and

C

is:
(

E

is mid-point of arm

C D

)

EASY

General Knowledge>General Science>Physics>Electricity

Two charges of equal magnitudes and at a distance $r$ exert a force $F$ on each other. If the charges are halved and distance between them is doubled, then the new force acting on each charge is

EASY

General Knowledge>General Science>Physics>Electricity

An electric current of

0.5 A

is passed for

8

minutes through the filament of an electric bulb. What will be the charge passing through the medium of the electric current?

EASY

General Knowledge>General Science>Physics>Electricity

Which of the following terms does not represent electrical power in a circuit?

EASY

General Knowledge>General Science>Physics>Electricity

A charged particle initially at rest at

O

, when released follows a trajectory as shown. Such a trajectory is possible in the presence of
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HARD

General Knowledge>General Science>Physics>Electricity

Three charged particles $A, B$ and $C$ with charges $- 4 q, 2 q$ and $- 2 q$ are present on the circumference of a circle of radius $d .$ The charged particles $A, C$ and centre $O$ of the circle formed an equilateral triangle as shown in the figure. The electric field at the point $O$ is
Question Image

MEDIUM

General Knowledge>General Science>Physics>Electricity

Three charges

+ Q, q, + Q

are placed respectively, at distance,

0, d / 2

and

d

from the origin, on the

x

-axis. If the net force experienced by

+ Q,

placed at

x = 0,

is zero, then value of

q

is:

HARD

General Knowledge>General Science>Physics>Electricity

A particle of mass

m

and charge

q

is released from rest in a uniform electric field. If there is no other force on the particle, the dependence of its speed

v

on the distance

x

travelled by it is correctly given by (graphs are schematic and not drawn to scale)

EASY

General Knowledge>General Science>Physics>Electricity

Two point charges A and B, having charges

+ Q

and

- Q

respectively, are placed at certain distance apart and force acting between them is

F

. If

25 %

charge of

A

is transferred to

B

, then the force between the charges becomes

EASY

General Knowledge>General Science>Physics>Electricity

Amongst the following, the form of water with the lowest ionic conductance at

298 K

is:

MEDIUM

General Knowledge>General Science>Physics>Electricity

What will be the direction of the magnetic field at the very bottom point of a horizontal power line, where the current flows from east to west when viewed from the west end?

MEDIUM

General Knowledge>General Science>Physics>Electricity

The commonly used safety fuse-wire is made up of _____.

HARD

General Knowledge>General Science>Physics>Electricity

Two positively charged spheres of masses

m_{1} and m_{2}

are suspended from a common point at the ceiling by identical insulating massless strings of length

l

. Charges on the two spheres are

q_{1} and q_{2}

, respectively. At equilibrium, both strings make the same angle

θ

with the vertical. Then

HARD

General Knowledge>General Science>Physics>Electricity

Two identical charged spheres suspended from a common point by two massless strings of lengths

l

, are initially at a distance

d (d ≪ l)

apart because of their mutual repulsion. The charges begin to leak from both the spheres at a constant rate. As a result, the spheres approach each other with a velocity

υ

. Then

υ

varies as a function of the distance

x

between the spheres, as

HARD

General Knowledge>General Science>Physics>Electricity

An electron falls from rest through a vertical distance

h

in a uniform and vertically upward directed electric field

E

. The direction of electric filed is now reversed, keeping its magnitude the same. A proton is allowed to fall from rest in it through the same vertical distance

h

. The time of fall of the electron, in comparison to the time of fall of the proton is

Four charges are placed at the circumference of a dial clock and one in middle as shown in the figure. The direction of net force of the given four charges on the middle one will point as if it is _________ in the clock.

Important Questions on Physics

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