Question

How much work would be required to move an electron from 0.0529 × 10-9 m from a proton to four times that distance? 5.4 × 10-18J 3.3 × 10-18J 1.6 × 10-18J None are correct.

Answer 1

k q^2/(0.0529 × 10-9 ) * (1 - 1/4)

Answer 2

I don't understand can you write the rule

Answer 3

E1=E2 (mechanikal energy)
K1+U1=K2+U2
U1-U2=K2-K1
U1-U2=ΔΚ
U1-U2=W
so W=k*Q1*Q2/R1-k*Q1*Q2/R2

Answer 4

Q1=Q2=q
R2=4*R1
so
W=k*q^2/R*(1-1/4)
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