The number of protons always differs in atoms of different elements.
Answer:
The electric field is 
Explanation:
From the question we are told that
The peak magnitude of the magnetic field is 
Generally the peak magnitude of the electric field is mathematically represented as

Where c is the speed of light with value 
So


Explaination :
Momentum = mass x speed
p = (30 kg) (3 m/s)
p = 90 kg m/s