Q.

Four equal resistors, each of resistance 10Ω are connected as shown in the circuit diagram. The equivalent resistance between A and B is

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a

5 Ω

b

10 Ω

c

20 Ω

d

40 Ω

answer is B.

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Detailed Solution

It is a simple wheat stone’s bridge and no current will flow through the middle wire because of lack of potential difference across transistor.Req=20×2020+20=10Ω
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Four equal resistors, each of resistance 10Ω are connected as shown in the circuit diagram. The equivalent resistance between A and B is