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Q.

Five resistances are connected as shown in fig. The effective resistance between the points A and B is

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a

10/ 3 Ω

b

20 /3 Ω

c

15Ω

d

6 Ω

answer is A.

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Detailed Solution

Resistance between, A and B for upper pa = 2+3= 5ΩResistance between A and B for lower part = 4+6= 10ΩAs bridge is balanced, the two resistances are in parallel and the resistance 7Ω is ineffective. Thus 1R=15+110=310R=(10/3)Ω

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Five resistances are connected as shown in fig. The effective resistance between the points A and B is