Question

pls. solve question no. 7

Answer 1

see the figure !
I modified the question figure .

concept :- in Parallel combinations , we know that across each resistor potential difference is equal .

Hence, potential difference across 24 Ohm = 48 volt .
hence, current is passing through it ;
I = V/R = 48/24 = 2 A

and current is passing through 8 ohm resistor = 48/8 = 6 A .

hence, total current is passing through BY = 6 + 2 = 8A

again, we know , that in series combination, current is passing through each resistance are equal .
so,
current passing through XA or , AB or BY = 8 A .

hence current passing through XY ( Inet)= 8 A

now,
equivalent resistance between X and Y :
in AB three resistance are in parallel e.g 60 , 30 and 20 ohm so,
1/R1 = 1/60 + 1/30 + 1/20
R1 = 10 ohm

again, in two resistance 8 ohm and 24 ohm are in parallel so,
1/R2 = 1/8 + 1/24
R2 = 6

now ,
Req = 3 + 10 + 6 + 1 = 20 ohm

now, use ohm's law for finding potential difference between X and Y
V = Inet × Req
= 8 × 20 = 160 volt

hence, potential difference between X and Y = 160 volt
option (1) is correct