Tag: combination of resistors

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Multiple choice physics kirchhoff's law combination of resistors combination of cells combinations of components

The diagram shows a $40\Omega$ resistor and a $60\Omega$ resistor connected in parallel.
What is the total resistance between points P and Q?

  1. less than $40\Omega$
  2. $50\Omega$
  3. between $50\Omega$ and $100\Omega$
  4. $100\Omega$
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A Correct answer
Explanation
For parallel connection
$R _{eq}= \dfrac{R _1 \times R _2}{R _1 +R _2}$
$\implies R _{eq}= \dfrac{40 \times 60}{40+60}$
$\implies R _{eq}= 24 \Omega$

So, it is less than $40 \Omega$