In hooke’s law, what does k represent?
a. mass of the spring
b. length of the spring
c. force of the spring
d. stiffness of the spring
e. width of the spring

d) stiffness of the spring

Explanation:

As per Hooke's law for spring we know that restoring force of the spring is proportional to the displacement of the spring from its natural length

so it is given as

here

k = spring constant which depends on the material of the spring

here we know that

k = it is stiffness constant so more stiff spring will have more stiffness constant

it becomes positively charged by charging it