Electric force in electric field is given by:
Fe = q*E
q = charge on proton = +e = 1.6*10^-19 C
Now given that
Fe = Weight of proton
Fe = m*g
q*E = m*g
E = m*g/q
m = mass of proton = 1.67*10^-27 kg
g = 9.8 m/sec^2
So Using these values:
E = 1.67*10^-27*9.8/(1.6*10^-19)
E = 1.0*10^7 N/C
E = 10^-7 N/C
Correct option is D.
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