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The potential difference across the terminals of a battery is V1 when there is a current of I1 in the battery from the negative to the positive terminal. When the current is I2 in the reverse direction, the potential difference becomes V2.
a) Compute the internal resistance r of the battery?
b) Compute what is the emf ε of the battery?
Explain how much force must you exert to keep the pole motionless and horizontal?
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