Assertion(A): Electric field is always normal to equipotential surfaces and along the direction of decreasing order of potential
Reason(R): Negative gradient of electric potential is electric field.

Explanation

To solve the question regarding the assertion and reason provided, we will analyze each statement step by step.

### Step 1: Understanding the Assertion
**Assertion (A):** Electric field is always normal to equipotential surfaces and along the direction of decreasing order of potential.

- Equipotential surfaces are surfaces where the electric potential is constant. This means that no work is done when moving a charge along the surface.
- The electric field (E) is defined as the force per unit charge experienced by a positive test charge. It points in the direction of the force that a positive charge would experience.
- The electric field is always perpendicular (normal) to equipotential surfaces because if it were not, work would be done on a charge moving along the surface, which contradicts the definition of equipotential surfaces.
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