Physics Crash Course NEET>Chapter 12 - Electrostatics>Level 1>Q 19

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Earn 100

The ratio of forces between two small spheres with constant charge in air and in a medium of dielectric constant $k$ is

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Important Questions on Electrostatics

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Physics Crash Course NEET>Chapter 12 - Electrostatics>Level 1>Q 20

The radius of a nucleus is given by

r_{0} A^{1 / 3}

where

r_{0} = 1.3 \times 10^{- 15} m

and

A

is the mass number of the nucleus, the Lead nucleus has

A = 206

, the electrostatic force between two protons in this nucleus is approximately

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Physics Crash Course NEET>Chapter 12 - Electrostatics>Level 1>Q 21

When distance between two point charges (one positive and the other negative) is halved, then the electrostatic force between the charges will

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Physics Crash Course NEET>Chapter 12 - Electrostatics>Level 1>Q 22

Two charges are placed a certain distance apart in air. When a dielectric sheet is placed between them, the electrostatic force between them will

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Physics Crash Course NEET>Chapter 12 - Electrostatics>Level 1>Q 23

A body has

- 80

micro coulomb of charge. The number of additional electrons in it will be

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Physics Crash Course NEET>Chapter 12 - Electrostatics>Level 1>Q 24

A charge $Q_{1}$ exerts some force on a second charge $Q_{2} .$ If a third charge $Q_{3}$ is brought near, the force of $Q_{1}$ exerted on $Q_{2}$ :

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Physics Crash Course NEET>Chapter 12 - Electrostatics>Level 1>Q 25

Two parallel plate air capacitors of the same capacity

C

are connected in series to a battery of emf

E

. Then one of the capacitors is completely filled with the dielectric material of constant

K

. The change in the effective capacitance of the series combination is

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Physics Crash Course NEET>Chapter 12 - Electrostatics>Level 1>Q 26

For a polar molecule, which of the following statements is true?

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Physics Crash Course NEET>Chapter 12 - Electrostatics>Level 1>Q 27

A

60 μF

parallel plate capacitor whose plates are separated by

6 mm

is charged to

250 V

, and then the charging source is removed. When a slab of dielectric constant

5

and thickness

3 mm

is placed between the plates, find the change in the potential difference across the capacitor?