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What is the amount of work done in bring...

What is the amount of work done in bringing a mass from the surface of Earth on one side to a point diametrically opposite on the other side?

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When battery is being charged by a 120 V d.c. supply, the current in battery is in opposite direction of the normal connections of battery of supplying current. So the potential difference across battery
V=E+Ir……….(i)
Given `E=8vol t r=0.5 Omega`
Current in circuit `r=(120-8)/(15.5+0.5)=112/16=7A therefore V=8+7 times 0.5=11.5 volt`
Series resistance limits the current drawn from external d.c. source. In the absence of series resistance the current may exceed the safe-value permitted by storage battery.
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