Question 20: NCERT Solutions for 12th Class Physics: Chapter 3-Current Electricity

Question

Nilima NilimaEnlightened

Asked: March 29, 20222022-03-29T08:41:05+00:00 2022-03-29T08:41:05+00:00In: Physics

(a) Given n resistors each of resistance R, how will you combine them to get the

maximum
minimum effective resistance? What is the ratio of the maximum to minimum resistance?

(b) Given the resistances of 1 Ω, 2Ω, 3Ω, how will be combine them to get an equivalent resistance of

(c) Determine the equivalent resistance of network shown in figure.

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Nilima Nilima · Answer 1 · 2022-03-29T08:47:54+00:00

Solution:

(a)

For maximum effective resistance, all the resistors should be joined in series. Rm_max = R + R + R+……..n or R_max = nR
For minimum effective resistance, all the resistors should be joined in parallel.

(b) All possible combinations with resistances 1 Ω, 2 Ω and 3 Ω are

So, the combinations for the desired results can be selected.

Check the complete chapter with solutions.