QUESTION Is it possible for the current through a battery to be directed from th

Question

QUESTION Is it possible for the current through a battery to be directed from the positive terminal toward the negative terminal? (Select all that apply.)

Yes. It happens inside a rechargeable flashlight battery or a car battery during recharge.Yes. It can happen when the voltage applied to a battery is greater than its emf.No. The charge carriers inside a battery is never reversible.

PRACTICE IT

EXERCISE HINTS:  GETTING STARTED  |  I'M STUCK!

Find the three currents in figure b, where R = 2.1 ?. (Note that the direction of one current may have been chosen wrongly!)

Explanation / Answer

Yes. It can happen when the voltage applied to a battery is greater than its emf.

(Yes. It happens inside a rechargeable flashlight battery or a car battery during recharge)

Applying KVL in upper loop:

e + 4i2 +10 - 6i1 = 0

6i1 - 4i2 = 22 .........(i)

KVL in lower loop:

10 - 6i1 - 2i3 = 0

6i1 + 2i3 = 10 .........(ii)

Applying KCL:

i1 + i2 = i3

i1 + i2 - i3 = 0 .......(iii)

solving equations,

i1 = 21/11 = 1.91 A

i2 = -29/11 = - 2.64A

i3 = -8/11 = - 0.727 A

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