2017

Physics Electrostatics Level: High School

If the work required to move a +0.35 C charge from point A to point B is +125 J , what is the potential difference between the two points ?

a) zero volts.

b) 44 V

c) 88 V

d) 180 V

e) 360 V

2016

Physics Electrostatics Level: High School

Two point charges are arranged along the x axis as shown in the figure at ‘click here’ . At which of the following values of x is the electric potential equal to zero ? Note : At infinity, the electric potential is zero .

a) +0.05 m

b) +0.29 m

c) +0.40 m

d) +0.54 m

e) +0.71 m

2015

Physics Electrostatics Level: High School

Two positive point charges are separated by a distance R. If the distance between the charges is reduced to R/2, what happen to the total electric potential energy of the system ?

a) It is doubled

b) It remains the same

c) It increase by a factor of 4

d) It is reduced to one-half of its original value

e) It is reduced to one-fourth of its original value

2008

Physics Electrostatics Level: High School

Two charges are positioned as shown in the figure at “click here”

a) Find the Electric field strength E at point A

b) Find the electric potential V at point A

c) Find the force F on an electron at point A

d) Find the potential energy of the pair of charges

1986

Physics Electrostatics Level: High School

A tiny sphere caries a charge of (3)*(10 to the -6th power)C . How large a force would it exert on a +4C point charge placed 300 cm away ? what are the magnitude and the direction of the electric field strength 300 cm from the center of the sphere ?