Question

find the equivalent resistance​

Answer 1

it's a wheatstone bridge (ratio is same)

so beech wala hat jaega

ab upar ke dono 10 series mein aa jaenge aur neeche k dono 10 seriea mein

upar hua 20 aur niche hua 20

ye dono ek doosre k parallel hue sor equivalent resistance will be 10.

Answer 2

Well if you know something called the concept of Wheatstone bridge which says that the ratio of adjacent but opposite resistance is equal then the resistance enclosed between all the four individual resistances can be neglected

This, here we can clearly see, that ratio of all the resistances is obviously going to be equal because the magnitude is already equal for all the resistances.

So, the middle 10 ohm resistance can be neglected.

So, now there remains two 10 ohm resistors in series and parallel to another pair of 10 ohm resistors.

So, 1/equivalent resistance = 1/20+1/20

Equivalent resistance = 10 ohms.