Answer:
Electrons
Explanation:
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If one of two interacting charges is doubled, the force between the charges will double.
Explanation:
The force between two charges is given by Coulomb's law

K=constant= 9 x 10⁹ N m²/C²
q1= charge on first particle
q2= charge on second particle
r= distance between the two charges
Now if the first charge is doubled,
we get 
F'= 2 F
Thus the force gets doubled.
Answer:
0.00956770833 T
Explanation:
q = Charge of electron = 
m = Mass of proton = 
a = Acceleration = 
v = Velocity = 
Magnetic field is given by

The magnetic field is 0.00956770833 T
Any object that is moving has Kinetic energy
The answer is c to take a pictures with the camera in the metal hall