Answer:
0.001m
Step-by-step explanation:
Energy=3.2×10^-18J
By conservation of energy,
energy=work done
potential gradient=E=200Vcm‐1=20000V/m
q=charge of electron=1.6×10^-19
Now,
Work done= qEd
3.2×10^-18 = 1.6×10^-19×20000×d
.
.
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solve for d
d=0.001m