Two particles each with a charge -Q are fixed a distance L apart . Each particle experiences a net electric force F. A particle with a charge +q is now fixed midway between the original two particles. As a result, the net electric force experienced by each negatively charged particle is reduced to F/2. The value of q is:. A. Q
B. Q/2
C. Q/4
D. Q/8
E. Q/16

B. Q/2

Explanation:

Given;

charge of the two particles, = -Q

distance between the two charges, r = L

the net force experienced by each charge = F

Apply coulomb's force between two charged particles;

when

+q is introduced midway between the charges, the net force is reduced by 2

Thus, The value of q is Q/2

the first, second, and fifth options

answer: 802.3 kilo joules of energy represents 191.75 kilo calorie of energy.

explanation:

energy released during combustion of one mole methane = 802.3 kilo joules

if 1 kilo joule = 0.239006   kilo calorie

then ,802.3 kilo joule will be = 802.30.239006 kilo calorie

802.3 kilo joule = 191.75 kilo calorie

hence, the energy in kilo calorie is 191.75 kilo calorie.