Simple Physics#2

Electricity and Magnetism Level 2

A circular loop has resistance 12 ohm.Tow points $P$ and $Q$ are selected on the loop, so that the loop will be divided into two parts in the ratio 1 : 3. Electric cell of 9 volt is applied across $P$ and $Q$ . Calculate the total current across the loop.

The answer is 4.

1 solution

Elliott Davies
Jun 15, 2015

Resistances of two sections of the loop are 3 and 9, combined resistance:

$\frac{1}{R}=\frac{1}{3\Omega}+\frac{1}{9\Omega}\Rightarrow R=\frac{9}{4 }\Omega$ ,

$I=\frac{V}{R}=\frac{9}{{9/4}}=4A$

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Brilliant Mathematics Staff - 5 years, 12 months ago

Simple Physics#2

The answer is 4.

1 solution

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