Which among the below mentioned operators is supposed to be zero so as to justify the scalar field to be harmonic?

a. Gradient

b. Curl

c. Laplacian

d. Divergence

ANSWER: Laplacian

Explanation:

A function is said to be harmonic only when its laplacian operator value ▼2f is zero. Similarly, a scalar field is also said to be harmonic only when its laplacian operator becomes zero despite the other operators.