In the given circuit, viewed from AB, the circuit can be reduced to an equivalent circuit as:

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DDA JE (E&M) Official Paper (Held on 25 April 2018)
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  1. 1 volt source in series with 10 Ω resistor
  2. 7 volts source in series with 2.4 Ω  resistor
  3. 5 volts source in series with 10 Ω resistor
  4. 15 volts source in series with 2.4 Ω resistor

Answer (Detailed Solution Below)

Option 2 : 7 volts source in series with 2.4 Ω  resistor
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Detailed Solution

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Thevenin's Theorem:

Thevenin’s Theorem states that “Any linear circuit containing several voltages and resistances can be replaced by just one single voltage in series with a single resistance connected across the load".

Thevenin's equivalent circuit:

Calculation of Rth:

6 Ω and 4 Ω are in parallel

Rth = 2.4 Ω 

Calculation of Vth:

5Vth = 35

Vth = 7 V

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