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JEE Main2015PhysicsCurrent ElectricityActual

A 10   V battery with internal resistance 1   Ω and a 15   V battery with internal resistance 0.6 Ω are connected in parallel to a voltmeter (see figure). The reading in the voltmeter will be close to:

Options

  1. A11.9 V
  2. B13.1 V
  3. C12.5 V
  4. D24.5 V

Correct answer

B. 13.1 V

Step-by-step solution

The equivalent emf of the battery parallel combination is given as Equation =   E 1 r 1     +   E 2 r 2 1 r 1   +   1 r 2 =   10 1   +   15 0.6 1   1   +   1   0.6 =   10 +   150 6 1 +   10 6   = 105 8 = 13.1   V ∴       The reading measured by voltmeter = 13.1   V

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