Given that
energy U=50*10^-12 J
volume V=64 cm
basing on the concept of electrostatices
now we find the electric field
electric field E=[2U/V]^1/2
=[2*50*10^-12/8.85*10^-12*64*10^-6]^1/2
=0.4202*10^3
=420.2 V/m
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