Current Electricity and Electrical InstrumentHard

Question

A set of 'n' equal resistors, of value 'R' each, are connected in series to a battery of emf 'E' and internal resistance 'R'. The current drawn is I. Now, the 'n' resistors are connected in parallel to the same battery. Then the current drawn from battery comes 10 I. The value of 'n' is :-

Options

A.

10

B.

11

C.

20

D.

9

Solution

I=EnR+R               .........(1)101=ERn+R=nER+nR   ........(2)
From (1) & (2),
nER+nR=10EnR+R
n = 10

Create a free account to view solution

View Solution Free
Topic: Current Electricity and Electrical Instrument·Practice all Current Electricity and Electrical Instrument questions

More Current Electricity and Electrical Instrument Questions

In the previous question potential at point 0 is...Identify which of the following diagrams represent the internal construction of the wound in a resistance box or PO box?...For the resistance network shown in the figure, choose the correct option(s)...A certain metallic surface is illuminated with monochromatic light of wavelength, λ. The stopping potential for pho...In the circuit shown in the figure, the current through...