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Charging by Friction

What is the f...

Question

What is the final potential of point b with respect to ground when switch S is closed?

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Solution

Current flows through two resistors,
$i = \frac{I 8 - 0}{6 + 3} = 2 A$
$∴ V_{b} - 0 = i R = 2 \times 3$
or $V_{b} = 6 V$

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