Two point charges Q1 = +4.10 nC and Q2 = −2.40 nC are separated by 55.0 cm.(a) What is the electric potential at a point midway between the charges? 212.7 Incorrect: Your answer is incorrect. Use the expression for the electric potential from each point charge to find the electric potential at the midpoint between the two charges. V(b) What is the potential energy of the pair of charges? 3.22E-7 Incorrect?

a. 55.6v

b.

Explanation:

Data given

charge 1=+4.10nC

charge 2 =-2.40nC

distance, r= 55cm =0.55m

a. the electric potential at the mid point is the sum of the potential due to individual charge.

The electric potential is expressed as  

since we are interested in the electric potential at the mid point, we have

Hence the electric potential at the mid-point is 55.6v

b. to calculate the potential energy, we use the formula below