Can a body have a charge of : 0 . 32 × 10 - 18 C ?

A charge is a quantized property which means it exists in the whole number multiples of 1 . 6 × 10 - 19 C Q = ne n is the number of electrons e is the charge of an electron. Given that body has charge of 0 . 32 × 10 - 18 C Putting the values we get, 0 . 32 × 10 - 18 = n × 1 . 6 × 10 - 19 n = 0 . 32 × 10 - 18 1 . 6 × 10 - 19 = 2 As n = 2 is an integer Hence, a body can have a charge of 0 . 32 × 10 - 18 C .

A polythene piece rubbed with wool is found to have a negative charge of 3 . 2 × 10 - 7 C . Find the> (a) number of electrons transferred. (b) mass gained by the polythene.

Given, Net charge on polythene, Q = 3 . 2 × 10 - 7 C (a) According to Quantization of electric charge, Net charge on polythene is integral multiple of basic charge ⇒ Q = n e where n is number of electron transferred and e is charge on an electron ⇒ n = Q e = 3 . 2 × 10 - 7 1 . 6 × 10 - 19 = 2 × 10 12 (b) We know, mass of an electron, m e = 9 . 1 × 10 - 31 kg Mass gained by the polythene, M = mass of an electron m e × number of electrons transferred n ⇒ M = m e n = 9 . 1 × 10 - 31 × 2 × 10 12 ⇒ M = 1 . 82 × 10 - 18 kg

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Beta Question Bank for Medical: Physics>Chapter 22 - Electrostatics>BEGINNER'S BOX - 1>Q 1

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IMPORTANT

Earn 100

In a neutral sphere, $5 \times 10^{21}$ electrons are present. If $10$ percent electrons are removed, then calculate the charge on the sphere.

Important Questions on Electrostatics

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Beta Question Bank for Medical: Physics>Chapter 22 - Electrostatics>BEGINNER'S BOX - 1>Q 2

Can a body have a charge of :

0.32 \times 10^{- 18} C

?

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Beta Question Bank for Medical: Physics>Chapter 22 - Electrostatics>BEGINNER'S BOX - 1>Q 3

Can a body have a charge of : 0.64 × 10^-20 C ?

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Beta Question Bank for Medical: Physics>Chapter 22 - Electrostatics>BEGINNER'S BOX - 1>Q 4

Can a body have a charge of : 4.8 × 10^-21 C ?

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Beta Question Bank for Medical: Physics>Chapter 22 - Electrostatics>BEGINNER'S BOX - 1>Q 5

A glass tumbler contains

1

billion amoeba and two sodium ions are there on the body of each amoeba. Find out the charge contained in the glass.

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Beta Question Bank for Medical: Physics>Chapter 22 - Electrostatics>BEGINNER'S BOX - 1>Q 6

How many electrons should be removed from a conductor so that it acquires a positive charge of

3.5 nC

?

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Beta Question Bank for Medical: Physics>Chapter 22 - Electrostatics>BEGINNER'S BOX - 1>Q 7

It is now believed that protons and neutrons (which constitute nuclei of ordinary matter) are themselves built out of more elementary units called quarks. A proton and a neutron consist of three quarks each. Two types of quarks, the so called ‘up’ quark (denoted by

u

) of charge

+ (2 / 3) e,

and the ‘down’ quark (denoted by

d

) of charge

(- 1 / 3) e,

together with electrons build up ordinary matter. (Quarks of other types have also been found which give rise to different unusual varieties of matter.) Suggest a possible quark composition of a proton and neutron.

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Beta Question Bank for Medical: Physics>Chapter 22 - Electrostatics>BEGINNER'S BOX - 1>Q 8

Three parallel metallic plates, each area $A$ are kept as shown in the figure and charges $Q_{1}$ , $Q_{2}$ and $Q_{3}$ are given to them. Edge effects are negligible. Calculate the charges on the two outermost surfaces $a$ and $f$ .