The work done to take an electron from rest where potential is $-60\, V$ to another point where potential is $-20\, V$ is given by.....$eV$
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$W = q(\Delta V)$
$W = -e(-20 + 60)$
$W = 40\, eV$
$W = -e(-20 + 60)$
$W = 40\, eV$
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