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Resistors Combination – Numerical Problem

What is the effective resistance between P and Q in the diagram?


Asked Malik Ahmed

Answer : 8 ohms

The Two arms have resistances 32 ohm and are in parallel, Their effective resistance is 1 ohms. This is in parallel with the middle arm. So the effective resistance is 8 ohms.



The three arms have resistances 32, 1 and 32 respectively and are in parallel. Therefore, taking their reciprocals and adding will give the answer.

Life, Atoms and Physics

Vaibhav came with the question, “The life we consider to be living is lifeless itself as the atoms of which we all are ultimately made up of are non- living themselves. Isn’t it really so?”

What do you think? Does atoms make life? Is life different from Atoms?

We the living things are made up of atoms; the nonliving things too are made up of atoms. So, isn’t life something different from mere combination of atoms. It is “life” which makes the collection of atoms of various kinds live – grow, sustain, reproduce etc.

Think deep and your comments are always welcome

Download the newly included portion by CBSE for CLASS 12 Physics

CBSE has added some content for class XII. This includes mainly portions from “Combination of mirrors and lenses

XII Class Supplementary Study Material

Click to access XIIth-Class-STM.pdf

A Numerical from Combination of thin lenses in contact

Two thin lenses of focal lengths f1=20cm and f2=60cm are placed in contact. find the focal length f3 of the combined lenses. find also the focal length f of a third lens placed in contact with these two that would result in overall focal length f11=-40cm. (Asked Young)

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