Electric Field Strength and Electric Potential

Question 1

For a small positive charge, +q, moved from an infinite distance to point P, in an electrical field surrounding another point charge, +Q and P is r away from the point charge +Q. What is the magnitude of the force exerted on the small positive charge?

Answer 1

F =Qq/4TTEor^2

Question 2

Define electric field strength.

Answer 2

Electric field strength is the force exerted per unit positive charge.

E=F/Q

Question 3

For a small positive charge, +q, moved from an infinite distance to point P, in an electrical field surrounding another point charge, +Q and P is r away from the point charge +Q. What is the electric field strength at P? Is it a vector or scalar quantity?

Answer 3

E = F/Q

E = Qq/4TTEor^2/q

E = Q/4TTEor^2

Electric field strength is a vector quantity.

Question 4

Consider an isolated point charge +Q and a small positive charge +q is moved from an infinite distance to point, P which is r distance from the point charge. What an equation for the electric potential at point P?

Answer 4

V = W/Q

where W is the work done is bringing unit positive charge from infinity to point P.

V = Fd/Q
V = Qq/4TTEor^2 (r)/q

V = Q/4TTEo(r)

Question 5

What is the SI unit of electric potential?

Answer 5

The SI unit of electric potential is the volt.

Question 6

Is electric potential a vector or scalar quantity?

Answer 6

It is a scalar quantity.

Question 7

Define equipotential line.

Answer 7

The equipotential line is a line drawn through points that are equidistant from the point charge that says that all those charges are at the same electric potential.