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KCET2017PhysicsCurrent Electricity

The value of I in the figure shown below is

Options

  1. A( 8 ~A )
  2. B( 21 ) A
  3. C( 19 ~A )
  4. D( 44 )

Correct answer

B. ( 21 ) A

Step-by-step solution

According to Kirchhoff's 1st law, at any junction in a circuit, the sum of currents arriving at the junction is equal to the sum of currents leaving the junction. Therefore, ( 20 A+4 A=3 A+I ) ( I=21 A )

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