Question

35. In the following circuit find current delivered by 10 V battery
20
20 V
10 V
(1) 3 A
(3) 1A
(2) 2A
(4) Zero​

Answer 1

Given :  A circuit having two voltage source 10V & 20V  and three resistance of 2 ohm each

To find : current delivered by 10 V battery

Solution:

Let say current from I0 V is I₁   &

Current from 20V  is  I₂  

10 = 2I₁   + 2( I₁ + I₂)

=> 5 = I₁ + I₁ + I₂

=> 5 = 2I₁ + I₂

20 =  2I₂  + 2I₂     ( current entering and exiting at any point are equal  )

=> 20 = 4I₂

=> I₂ = 5

5 = 2I₁ + I₂

=> 5 = 2I₁ + 5

=> 2I₁ = 0

=> I₁ = 0  

current delivered by 10 V battery is Zero

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