IIT JEE Advanced 2011 Paper 2

• According to Gauss’s law: ∮

→

E

.

→

dA

=

qin

ε0

that is, it is constant with respect to a distance from a point charge. That is, the electric flux from a point charge is directly proportional to

1

√r

(in new conditions and which is not constant). Hence, option (A) is not correct.
• Gauss’s law is for finding the flux, but not used for finding the field the distribution. Hence, option (B) is not correct.
• If there are two charges, then option (C) is correct.
• The work done by electrostatic force to move a point charge from VA to VB is VB–VA. Hence, option (D) is correct.