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Two equal and opposite charges are placed at points $P$ and $Q .$ The null point on the line joining them is

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Important Questions on Electrostatics

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Physics Crash Course NEET>Chapter 12 - Electrostatics>Level 3>Q 7

A parallel plated capacitor has area

2 m^{2}

separated by

3

dielectric slabs. Their relative permittivity is

2, 3, 6

and thickness is

0.4 mm, 0.6 mm, 1.2 mm

respectively. The capacitance is

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Physics Crash Course NEET>Chapter 12 - Electrostatics>Level 3>Q 8

A parallel plate capacitor has a capacity

C .

The separation between the plates is doubled and a dielectric medium is inserted between the plates. If the capacity is

3 C,

then the dielectric constant of the medium will be

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Physics Crash Course NEET>Chapter 12 - Electrostatics>Level 3>Q 9

Assertion :- Conductivity of a metals is much higher than that of an electrolyte at room temperature.

Reason :- Free electron density in metals is much larger than the density of ions in electrolytes and also free electrons have greater mobility than ions.

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Physics Crash Course NEET>Chapter 12 - Electrostatics>Level 3>Q 10

A simple pendulum is suspended in a lift which is going up with an acceleration of

5 m s^{- 2}

. An electric field of magnitude

5 N C^{- 1}

and directed vertically upward is also present in the lift. The charge of the bob is

1 μC

and mass is

1 mg

. Taking

g = π^{2}

and length of the simple pendulum

1 m

, find the time period of the simple pendulum (in seconds).

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Physics Crash Course NEET>Chapter 12 - Electrostatics>Level 3>Q 11

Two point charges

q_{1} (\sqrt{10} μC)

and

q_{2} (- 25 μC)

are placed on the

x

-axis at

x = 1 m

and

x = 4 m

respectively. The electric field

(in V m^{- 1})

at a point

y = 3 m

y

-axis is,

[Take \frac{1}{4 π ϵ_{0}} = 9 \times 10^{9} N m^{2} C^{- 2}]

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Physics Crash Course NEET>Chapter 12 - Electrostatics>Level 3>Q 13

Two charged thin infinite plane sheets of uniform charge density

σ_{+}

and

σ_{-}

, where

|σ_{+}| > |σ_{-}|

, intersect at the right angle. Which of the following best represents the electric field lines for the system:

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Physics Crash Course NEET>Chapter 12 - Electrostatics>Level 3>Q 14

An oil drop of the radius

2 mm

with a density

3 g

{cm}^{- 3}

is held stationary under a constant electric field

3.55 \times 10^{5} V m^{- 1}

in the Millikan's oil drop experiment. What is the number of excess electrons that the oil drop will possess?

(consider g = 9.81 m s^{- 2})

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Physics Crash Course NEET>Chapter 12 - Electrostatics>Level 3>Q 15

Shown in the figure is a shell made of a conductor. It has inner radius $a$ and outer radius $b$ , and carries charge $Q$ . At its centre a dipole $\vec{p}$ is placed as shown then:
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Two equal and opposite charges are placed at points P and Q. The null point on the line joining them is

Important Questions on Electrostatics

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Two equal and opposite charges are placed at points $P$ and $Q .$ The null point on the line joining them is