Current Electricity 2 Question 18

18. A battery of internal resistance 4Ω is connected to the network of resistances as shown in figure. In order that the maximum power can be delivered to the network, the value of R in Ω should be

(1995, 2M)

(a) 49

(b) 2

(c) 83

(d) 18

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Solution:

  1. The given circuit is a balanced Wheatstone’s bridge.

Thus, no current will flow across 6R of the side CD. The given circuit will now be equivalent to

For maximum power, net external resistance

= Total internal resistance or



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