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Standard XII
Physics
Is Electrostatic Force Conservative
17.Positive a...
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17.Positive and negative point charges of equal magnitude are kept at (0,0,a/2)and(0,0,-a/2)respectively. The work done by the electric field when another positive point charge is moved from (–a,0,0) to (0,a,0) is
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Q.
Work done per unit charge in moving a unit positive charge from one point to another inside an electric field is called as__.
Q.
A point charge q is rotated along a circle in an electric field generated by another point charge Q. The work done by the electric field on the rotating charge in one complete revolution is
(a) zero
(b) positive
(c) negative
(d) zero if the charge Q is at the centre, otherwise non-zero
Q.
Two equal negative point charges
−
q
are fixed at points
(
0
,
a
)
and
(
0
,
−
a
)
on the
y-
axis. A positive point charge
Q
is in rest at point
(
2
a
,
0
)
on the
x-
axis. The net electric field on
Q
due to both
−
q
charges will be
(
1
4
π
ϵ
0
=
k
)
Q.
Assertion :A small electric dipole is moved translationally from higher potential to lower potential in uniform electric field. Work done by electric field is positive. Reason: When a positive charge is moved from higher potential to lower potential, work done by electric field is positive.
Q.
Electric field lines always point away from a positive charge and towards a negative point. In fact, electric fields originate at a positive charge and terminate at a negative charge. Why and how this happens so?
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