From resistances of 100 ohm each are connected in the form …

Physics Current Electricity NEET Previous Year Question MCQ (Single Correct)

From resistances of 100 ohm each are connected in the form of a square. The effective resistance along the diagonal points P R is:

100 Ω Ω

180 Ω Ω

220 Ω Ω

440 Ω Ω

Text Solution

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The correct answer is:

Here: Resistance of arm PQ (R 1 ) = 100 Ω Ω

Resistance of arm QR (R 2 ) = 100 Ω Ω

Resistance of arm RS (R 3 ) = 100 Ω Ω

Resistance of arm SP (R 4 ) = 100 Ω Ω

Resistance of upper arm R 1 and R 2 are connected in series.

Hence, their resultant resistance

R U = R 1 + R 2 = 100 +100 = 200 Ω Ω

Similarly the resistance of lower half R 3 and R 4 are also connected in series

Hence, their resultant resistance is

R L = R 3 + R 4 = 100 + 100 = 200 Ω Ω

So, equivalent resistance

So, R PR = 100 Ω Ω

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