Doubtclip is an AI tutor that turns any homework or exam doubt into a step-by-step whiteboard video lesson with diagrams, formulas, and voice explanation.

Which subjects and exams does it support?

It supports Physics, Chemistry, Mathematics/Calculus and related STEM doubts for school boards, JEE, NEET, and global high-school / undergrad practice.

How do I get a video solution?

Upload a photo of the question or paste the text, sign in, and Doubtclip generates a whiteboard-style explanation video you can watch and share.

Is Doubtclip available worldwide?

Yes. Doubtclip is a web app for students globally. Lessons are available in English and Hinglish.

Magnetic Effects & Magnetism

JEE Main level, single correct, medium

223 of 276

Question 223 of 276

A moving coil galvanometer has a coil with $175$ turns and area $1c{m}^{2}.$ It uses a torsion band of torsion constant ${10}^{-6}Nm/rad$ The coil is placed in a magnetic field B parallel to its plane. The coil deflects by ${1}^{o}$ for a current of $1mA$ The value of B (in tesla) is approximately:

Show answer and solution

Answer: (C) ${10}^{-3}$

For a moving coil galvanometer.

\tau =iANB=c\theta

B=\dfrac{c\theta }{iAN}=\dfrac{1{0}^{-6}}{1{0}^{-4}\times \left(175\right)\times \left(1{0}^{-3}\right)}\times \dfrac{\pi }{180}

B\approx 1{0}^{-3}T

JEE Main question paper PDF

Open a shift to read the full paper on this page, or download it.

JEE Main 2025 Apr 2 Shift 1 question paper

Open Download PDF

Opening paper…

Explain it as a whiteboard videoStep-by-step, in Hinglish or English. Your first video needs no login.Solved it on paper but got it wrong?Upload a photo of your working. Mistake Doctor marks the exact line that broke.

More Physics practice

JEE Main Physics practice question on Magnetic Effects & Magnetism (Force and Torque on Current Carrying Conductor), with the answer and a step-by-step solution. Scan a question from your own book or paper to get a whiteboard video.