Question

Please help!

Answer 1

• Work=W=5.0×10^-7J
• Charge=8.0nC=Q
• Vf=24V

We need potential difference V first

$\\ \sf\longmapsto V=\dfrac{W}{Q}$

$\\ \sf\longmapsto V=\dfrac{5\times 10^{-7}J}{8\times 10^{-9}C}$

$\\ \sf\longmapsto V=0.625\times 10^2V$

$\\ \sf\longmapsto V=62.5V$

Now

$\\ \sf\longmapsto V=V_f-V_i$

$\\ \sf\longmapsto V_i=V-V_f$

$\\ \sf\longmapsto V_i=62.5-24=38.5V$