Skip to content

A galvanometer of resistance G… (Class 12 Physics 2024, Q6)

questionbuddy.in/q/cbse-12-physics-2024-55-1-1-q6-galvanometer-resistance-converted-ammeter-range

PhysicsCBSE Class 12 · Board exam 2024, set 55/1/1 · 1 mark · MCQ

CBSE Class 12 Physics 2024: question 6

Set in the CBSE Class 12 board exam of 2024, paper 55/1/1, section A, question 6, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q6 · 1 mark · MCQMoving Charges and Magnetism

A galvanometer of resistance G Ω is converted into an ammeter of range 0 to I A. If the current through the galvanometer is 0.1% of I A, the resistance of the ammeter is :

  1. (A)
  2. (B)
  3. (C)
  4. (D)

Source: official question paper from cbse.gov.in (PDF). See it in the full 2024 board paper, set 55/1/1.

Hints

Open one hint at a time and try again before the next.

Hint 1

First find the shunt from .

Hint 2

The ammeter's resistance is the galvanometer and shunt in parallel.

Step-by-step solution

Each step shows the marks it earns, as an examiner would award them. Checked by an independent re-solve from the question paper.

  1. With , the shunt is .

  2. The ammeter resistance is G in parallel with S: . Option (B).

    1 mark

Answer: , option (B)

Where the marks are

  • Finds S = G/999 and the parallel combination G/1000 (1 mark)

Revise the chapter

Practise this chapterBoard-style questions from Moving Charges and Magnetism, one at a time, marked against the answer key and marking points.Back to the full paper2024 board paper, set 55/1/1: every question, by section.

The question is transcribed from the official paper; figures are described in words. The solution, hints and chapter tag are ours. Spotted an error? Write tosupport@questionbuddy.in.