Consider a disk of radius 4.9 cm with a uni- formly distributed charge of +5.6 (c. compute the magnitude of the electric field at a point on the axis and 3 mm from the center. the value of the coulomb constant is 8.98774 x 10 n m2/c2

Explanation:

Given that,

Radius of the disk, r = 4.9 cm = 0.049 m

Charge, q = +5.6 C

We need to find the the electric field at a point on the axis and 3 mm from the center, x = 0.003 m

At a point on the axis of a ring, the electric field is given by :

So, the electric field at a point on the axis is .  Hence, this is the required solution.