Home/
Competitive Exams/
JEE Main & Advanced/
Physics/
Magnetism/
Question 20237
JEE Physics · Medium

Magnetism: Galvanometer — Full Deflection MCQ

Solve this quality-checked JEE multiple-choice question, then review the correct answer and explanation.

Timer-based practiceDetailed answer reviewMobile-friendly flow
Galvanometer — Full DeflectionMediumQuestion 20237

Question

A galvanometer of resistance 20 Ω shows full deflection at 5 mA. To measure up to 2 A, the shunt resistance required is:
  1. A
    0.05 Ω
    Correct
  2. B
    0.1 Ω
  3. C
    1 Ω
  4. D
    0.5 Ω

Correct answer

0.05 Ω

Explanation

S = GIg/(I−Ig) = 20×0.005/(2−0.005) ≈ 0.1/1.995 ≈ 0.0501 Ω ≈ 0.05 Ω.

Review Magnetism notesStart timed chapter practice