To understand the electric potential and electric field of a point charge in three dimensions Consider a positive point charge q, located at the origin of three-dimensional space. Throughout this problem, use k in place of 14?

The magnitude of the electric field at distance r from the point charge q is

Explanation:

Suppose, Find E(r), the magnitude of the electric field at distance r from the point charge q.

We know that,

The electric field is proportional to the point charge and inversely proportional to the square of the distance from the charge point .

In mathematically,

Where, q = charge point

R = distance from charge point

Hence, The magnitude of the electric field at distance r from the point charge q is

true is the correct answer

hope i

can be answered using momentum.

momentum = p

p1= mass1 * velocity1

p1 = p2

therefore

p1 = 6kg * 4m/s

p1 = 24kgm/s

p2=m2 * v2

24 kgm/s = 7kg * v2

v2 = 24 kgm/s / 7kg

v2= 3.42 m/s