Assertion: Electric field is always normal to equipotential surfaces and along the direction of decreasing order of potential.
Reason: Negative gradient of electric potential is electric field.
Options:
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false and R is also false.