JEE Main 2019PhysicsMagnetic Effects of CurrentEasyMCQ

JEE Main 2019 — Magnetic Effects of Current Question with Solution

JEE Main 2019 (09 Apr Shift 2)

Question

A moving coil galvanometer has a coil with 175 turns and area 1 cm2. It uses a torsion band of torsion constant 10-6 N m/rad The coil is placed in a magnetic field B parallel to its plane. The coil deflects by 1o for a current of 1 mA The value of B (in tesla) is approximately:

Choose an option

Show full solutionCorrect option: C
Correct answer
C10-3

Step-by-step explanation

For a moving coil galvanometer.
τ=iANB=cθ
B=cθiAN=10-610-4×175×10-3×π180
B≈10-3 T

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About this question

This is a previous-year question from JEE Main 2019, covering the Magnetic Effects of Current chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.