A body can be charged by following methods.
(a) By friction : By rubbing two bodies together, both positive and negative charges in equal amounts appear simultaneously due to transfer of electrons from one body to the other.
(b) By electrostatic induction : If a charged body is brought near a neutral body, the charged body will attract opposite charge and repel similar charge present in the neutral body. As a result of this one side of neutral body becomes (+ ve) while the other (-ve). This process is called "electrostatic induction".
(c) By conduction : Take two conductors, one charged and other uncharged. Bring the conductors in contact with each other. The charge (whether - ve or $+$ ve) under its own repulsion will spread over both the conductors. Thus the conductors will be charged with the same sign.
1.When a body is charged by induction, then the body
(a) becomes neutral
(b) does not lose any charge
(c) loses whole of the charge on it
(d) loses part of the charge on it
2.On charging by conduction, mass of a body may
(a) increase (b) decreases
(c) increase or decrease
(d) None of these
3.If a body is positively charged, then it has
(a) excess of electrons
(b) excess of protons
(c) deficiency of electrons
(d) deficiency of neutrons
4.A clyindrical conductor is placed near another positively charged conductor. The net charge acquired by the cylindrical conductor will be
(a) positive only
(b) negative only
(c) zero
(d) either positive or negative
5.A positive point charge $\mathrm{Q}$ is brought near an isolated metal cube then
(a) the cube becomes negatively charged.
(b) the cube becomes positively charged.
(c) the interior becomes positively charged and the surface becomes negatively charged.
(d) the interior remains charge free and the surface gets nonuniform charge distribution.
a)b,c,c,c,a b)b,c,a,c,a c)b,d,c,c,a d)b,c,c,c,d
(b) Charging by induction involves transfer of charges from one part to the other of the body. No loss of charge is involved.
(c) On charging by conduction, body may gain mass, if it acquires negative charge. It may lose mass, if it acquires positive charge.
(c) Positive charge is due to deficiency of electrons.
(c) Net charge acquired by induction is zero, as there is only transfer of electrons from one part of body to the other.
(a) the cube becomes negatively charged.
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