Question

What will be the equivalent resistance between the two points A and D?

(a) 30 Ω

(b) 40 Ω

(c) 20 Ω

(d) 10 Ω

Answer 1

The correct option is (a).

Explanation:

Lower resistance on extreme left and upper resistance on extreme right are ineffective.

The resistance R₂ and R₃ are in series combination. 

Therefore their equivalent resistance,

R^' = R₂ + R₃ = 10 + 10 = 20 Ω 

Similarly, the resistance R₅ and R₆ are in series combination.

Therefore their equivalent resistance, 

R^''= R₅ + R₆ = 10 + 10 = 20 Ω.

Now the equivalent resistances R' and R'' are in parallel combination.

Therefore their equivalent resistance.

Thus equivalent resistance between A and D, R