First slide

Ohm's law

Question

In which one of the following arrangements of resistors does the ammeter M, that has a resistance of $2 Ω$ , give the largest reading when the same potential difference is applied between points P and Q?

Moderate

A
B
C
D

Solution

$\begin{array}{l} Let V_{PQ} = E \\ For (a); I = \frac{E}{4}; For (b) : I = \frac{E}{\frac{2}{3} + 2} \frac{E}{\frac{8}{3}} \\ For (c) : I = \frac{E}{2}; For (d) : I = \frac{E}{3} \end{array}$

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