Answer:
Explanation: according to Coulomb's inverse-square law is proportional to the square of distance between them and is given by

where r is the distance between the charges & k is the Coulomb's constant
k=1/(4*ε_0*π)
k=9*10^9
the distance between the charges in this question is d_1
hence the magnitude of the force exerted by q_0 on q_1 is given by

due to location of particle 1 above the particle 0 the direction of force is parallel to y axis and in vector form

Answer:
mercury and alcohol
ii) used to test temperatures
Answer: D. decreasing the temperature
Explanation: