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

**(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

- (11/3) Ω
- (11/5) Ω,
- 6 Ω,
- (6/11) Ω?

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

Solution:(a)_{max}= R + R + R+……..n or R_{max}= nR(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.

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