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Current Electricity question

2008 · Shift 0 · Q66
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Current Electricity question

2008 · Shift 0 · Q66

JEE MainPhysicsCurrent ElectricityMCQ+4 / −1
A 5V5V5V battery with internal resistance 2Ω2\Omega2Ω and a 2V2V2V battery with internal resistance 1Ω1\Omega1Ω are connected to a 10Ω10\Omega10Ω resistor as shown in the figure. AIEEE 2008 Physics - Current Electricity Question 308 English The current in the 10Ω10\Omega10Ω resistor is
  1. A
    0.27AP2  to  P10.27A{P_2}\,\,to\,\,{P_1}0.27AP2​toP1​
  2. B
    0.03AP1  to  P20.03A{P_1}\,\,to\,\,{P_2}0.03AP1​toP2​
  3. C
    0.03AP2  to  P10.03A{P_2}\,\,to\,\,{P_1}0.03AP2​toP1​
  4. D
    0.27AP1  to  P20.27A{P_1}\,\,to\,\,{P_2}0.27AP1​toP2​
View written solutionFree

Correct answer: D: $0.27\TEXT{ A } P_1 \TO P_2$

  1. Interpret the circuit

    The two batteries with internal resistances are connected in parallel between points P1P_1P1​ and P2P_2P2​, and the 10Ω10\Omega10Ω resistor is also connected across the same two points.

    Let the potential difference across the resistor be V=VP1−VP2.V = V_{P_1}-V_{P_2}.V=VP1​​−VP2​​.

    Then current through the 10Ω10\Omega10Ω resistor is IR=V10I_R = \frac{V}{10}IR​=10V​ taken positive from P1P_1P1​ to P2P_2P2​.

  2. Write branch currents

    For the 5 V5\text{ V}5 V battery with internal resistance 2Ω2\Omega2Ω: assuming its positive terminal is at P1P_1P1​ (as usual in such figure), current from P1P_1P1​ to P2P_2P2​ in that branch is I1=V−52.I_1 = \frac{V-5}{2}.I1​=2V−5​.

    For the 2 V2\text{ V}2 V battery with internal resistance 1Ω1\Omega1Ω: I2=V−2.I_2 = V-2.I2​=V−2.

    Through the resistor: IR=V10.I_R = \frac{V}{10}.IR​=10V​.

  3. Apply KCL at node P1P_1P1​

    Since there is no external connection, algebraic sum of currents from P1P_1P1​ to P2P_2P2​ through all three branches must be zero: V−52+(V−2)+V10=0.\frac{V-5}{2} + (V-2) + \frac{V}{10} = 0.2V−5​+(V−2)+10V​=0.

  4. Solve for VVV

    Multiply by 101010: 5(V−5)+10(V−2)+V=05(V-5) + 10(V-2) + V = 05(V−5)+10(V−2)+V=0 5V−25+10V−20+V=05V - 25 + 10V - 20 + V = 05V−25+10V−20+V=0 16V−45=016V - 45 = 016V−45=0 V=4516=2.8125 V.V = \frac{45}{16} = 2.8125\text{ V}.V=1645​=2.8125 V.

  5. Find current in the 10Ω10\Omega10Ω resistor

    IR=V10=2.812510=0.28125 A.I_R = \frac{V}{10} = \frac{2.8125}{10} = 0.28125\text{ A}.IR​=10V​=102.8125​=0.28125 A.

    So the current is approximately 0.28 A0.28\text{ A}0.28 A flowing from P1P_1P1​ to P2P_2P2​.

  6. Match with the given options

    Closest option is: 0.27 A from P1 to P2\boxed{0.27\text{ A from } P_1 \text{ to } P_2}0.27 A from P1​ to P2​​

    Hence, the correct option is D.

  7. Comparison with stored answer

    Stored correct answer is C: 0.03 A P2→P10.03\text{ A } P_2 \to P_10.03 A P2​→P1​.

    This does not match the circuit analysis. The likely correct answer is D.

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