Resistance

find the resistance between the points a and b.

please show me the full solution

19 Answers

1
abcd ·

yes but i see 30/11 as well brother

1
Aditya Balasubramanyam ·

the fig pposted by atgs leads to the right ans which is 3.95......devika ur ans is wrong... uttara ..sorry cant see ur ans

4
UTTARA ·

Which is the ans aditya

mine or devika's??

1
Aditya Balasubramanyam ·

yep that's the ans.. thanx ....

4
UTTARA ·

SORRY FOR THE POOR IMAGE

USE UR MAGNIFIER

4
UTTARA ·

1
devika lal ·

its 168/61 only...

1
Che ·

ya thats correct!

49
Subhomoy Bakshi ·

so this boils down to

now we hav 2 find resis b/w A n B nothing else...

1
Che ·

oh come on... lets put a smile on that face......from wat angle r u seeing that u r getting one more ans.!

1
Ankur Jay ·

This is kinda really easy. First we make circuit diagram. Dont ask me why I have split the middle part; it is how we do calculations in our skool. Actually i dont knw the actual reason why it is done.

For the upper triangle, net resistance = 12/7 ohm

Hence for the upper branch the net resistance = 4 + 12/7 + 6 = 82/7 ohm---------(1)

For the bottom triangle, net resistance = 56/11 ohm----------(2)

Now use parallel combination of resistors formula, and u find the net resistance of (1) and (2).

Hence net resistance of the entire network = 3.54 ohms.

1
Che ·

why 30/11 ishan.......dont u see ans is 168/61 Ω !!

1
abcd ·

30/11

49
Subhomoy Bakshi ·

yeh exactly.......and thus no current flows through r resistance system and so the resistance may be neglected

23
qwerty ·

bhargava , der is no potential difference across r , hence it is short

1
bhargavahariom ·

i think dat 6,8,14 are in parallel giving R.and 4,2,12 are in parallel giving r.now r and R are in series.

23
qwerty ·

yeah ans is coming 168/61 ,

1
Che ·

yup...subhomoy is correct.....jus short the wire along teh diagonal.....then basically it will be teh eq resis of 6,14 and 8 connected in parallel....

49
Subhomoy Bakshi ·

the above according to me is absolutely wrong....
answer is coming 168/61Ω

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