Two point charges Q and - Q 4 placed along the x -axis are separated by a distance r . Take - Q 4 as origin and it is placed to the right of Q . Then the potential is zero

both at x = r 3 and x = - r 5 only.

there exist two points on the axis where the electric field is zero.

The electric potential decreases uniformly from 120 V to 80 V as one moves on the x - axis from x = - 1 cm to x = + 1 cm . The electric field at the origin

may be greater than 20 V cm - 1 .

MEDIUM

JEE Advanced

IMPORTANT

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Two charged particles having charges $1 μC$ and $- 1 μC$ and of mass $50 g$ each are held at rest while their separation is $2 m$ . Now the charges are released. Find the speed of the particles when their separation is $1 m$ .

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Important Questions on Electric Potential

MEDIUM

JEE Advanced

IMPORTANT

PHYSICS for Joint Entrance Examination JEE (Advanced) Electrostatics and Current Electricity>Chapter 3 - Electric Potential>Exercise>Q 19

100 eV

electron is projected directly towards a large metal plate that has a surface charge density of

- 2.0 \times 10^{- 6} C m^{- 2}

. From what distance must the electron be projected if it is to just fail to strike that plate?

MEDIUM

JEE Advanced

IMPORTANT

PHYSICS for Joint Entrance Examination JEE (Advanced) Electrostatics and Current Electricity>Chapter 3 - Electric Potential>Exercise>Q 20

A point charge

q

is placed inside a conducting spherical shell of inner radius

2 R

and outer radius

3 R

at a distance of

R

from the centre of the shell. Find the electric potential at the centre of the shell.

HARD

JEE Advanced

IMPORTANT

PHYSICS for Joint Entrance Examination JEE (Advanced) Electrostatics and Current Electricity>Chapter 3 - Electric Potential>Exercise>Q 21

n

charged drops, each of radius

r

and charge

q

, coalesce to form a big drop of radius

R

and charge

Q

. If

V

is the electric potential and

E

is the electric field at the surface of a drop, then

EASY

JEE Advanced

IMPORTANT

PHYSICS for Joint Entrance Examination JEE (Advanced) Electrostatics and Current Electricity>Chapter 3 - Electric Potential>Exercise>Q 22

Four identical charges are placed at the points

(1, 0, 0), (0, 1, 0), (- 1, 0, 0)

and

(0, - 1, 0)

. Then,

EASY

JEE Advanced

IMPORTANT

PHYSICS for Joint Entrance Examination JEE (Advanced) Electrostatics and Current Electricity>Chapter 3 - Electric Potential>Exercise>Q 23

Two point charges

Q

and

- \frac{Q}{4}

placed along the

x

-axis are separated by a distance

r

. Take

- \frac{Q}{4}

as origin and it is placed to the right of

Q

. Then the potential is zero

EASY

JEE Advanced

IMPORTANT

PHYSICS for Joint Entrance Examination JEE (Advanced) Electrostatics and Current Electricity>Chapter 3 - Electric Potential>Exercise>Q 24

The electric potential decreases uniformly from

120 V

80 V

as one moves on the

x -

axis from

x = - 1 cm

x = + 1 cm

. The electric field at the origin

EASY

JEE Advanced

IMPORTANT

PHYSICS for Joint Entrance Examination JEE (Advanced) Electrostatics and Current Electricity>Chapter 3 - Electric Potential>Exercise>Q 25

A small sphere with mass $1.2 g$ hangs by a thread between two parallel vertical plates $5.00 cm$ apart. The plates are insulating and have uniform surface charge densities $+ σ$ and $- σ$ . The charge on the sphere is $q = 9 \times 10^{- 6} C$ . What potential difference between the plates will cause the thread to assume an angle of $37^{°}$ with the vertical as shown in figure ?

Question Image

EASY

JEE Advanced

IMPORTANT

PHYSICS for Joint Entrance Examination JEE (Advanced) Electrostatics and Current Electricity>Chapter 3 - Electric Potential>Exercise>Q 26

A particle of mass

m

carrying a charge

q

is projected with velocity

v

from point

P

towards an infinite line of charge from a distance

a

. Its speed reduces to zero momentarily at point

Q

, which is at a distance

\frac{a}{2}

from the line of charge. If another particle with mass

m

and charge

- q

is projected with same velocity

v

from

P

towards the line of charge, what will be its speed at

Q

Two charged particles having charges 1 μC and -1 μC and of mass 50 g each are held at rest while their separation is 2 m . Now the charges are released. Find the speed of the particles when their separation is 1 m .

Important Questions on Electric Potential

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Two charged particles having charges $1 μC$ and $- 1 μC$ and of mass $50 g$ each are held at rest while their separation is $2 m$ . Now the charges are released. Find the speed of the particles when their separation is $1 m$ .