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A galvanometer having full scale deflection current of 10 m A and resistance 8 Ω is joined in circuit as shown. When the terminals A and B are used and C remains open, the range of the ammeter is I . When the terminals A and C are used and B remains open, then the range of the ammeter is

Options

  1. AI
  2. BI 2
  3. CI 3
  4. D2 I 3

Correct answer

B. I 2

Step-by-step solution

When A and B is used I g = 2 ⋅ I 2 + 10 When A and C is used I g = 4 ⋅ I ′ 4 + 8 2 I 12 = 4 I ′ 12 I ′ = I 2

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