A moving coil galvanometer has a coil with 175 turns and area   1\:\:cm^{2}. 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  1^{0} for a current of 1\:\:mA . The value of B ( in Tesla ) is approximately :

  • Option 1)

    10^{-4}

  • Option 2)

    10^{-2}

  • Option 3)

    10^{-1}

  • Option 4)

    10^{-3}

 

Answers (1)

Given 

N=175

A=1\:\:cm^{2}

\Phi =\frac{\pi}{180}\:rad

I=10^{-3}A

C=10^{-6}N-m

\Rightarrow BINA=C\Phi

B=\frac{C\Phi}{INA}

B=\frac{10^{-6}}{10^{-3}\times 175 \times 10^{-4}}\times \frac{\pi}{180}=0.0010

B=10^{-3}\:\:Tesla

 


Option 1)

10^{-4}

Option 2)

10^{-2}

Option 3)

10^{-1}

Option 4)

10^{-3}

Preparation Products

Knockout JEE Main April 2021 (One Month)

Personalized AI Tutor and Adaptive Time Table, Self Study Material, Weekend Live Classes, Mentorship from our Experts, Unlimited Mock Tests and Personalized Analysis Reports, 24x7 Doubt Chat Support,.

₹ 14000/- ₹ 6999/-
Buy Now
Knockout JEE Main May 2021

Personalized AI Tutor and Adaptive Time Table, Self Study Material, Weekend Live Classes, Mentorship from our Experts, Unlimited Mock Tests and Personalized Analysis Reports, 24x7 Doubt Chat Support,.

₹ 22999/- ₹ 14999/-
Buy Now
Test Series JEE Main May 2021

Unlimited Chapter Wise Tests, Unlimited Subject Wise Tests, Unlimited Full Mock Tests, Get Personalized Performance Analysis Report,.

₹ 6999/- ₹ 4999/-
Buy Now
Knockout JEE Main April 2022

Personalized AI Tutor and Adaptive Time Table, Self Study Material, Weekend Live Classes, Mentorship from our Experts, Unlimited Mock Tests and Personalized Analysis Reports, 24x7 Doubt Chat Support,.

₹ 34999/- ₹ 24999/-
Buy Now
JEE Main Rank Booster 2021

Booster and Kadha Video Lectures, Unlimited Full Mock Test, Adaptive Time Table, 24x7 Doubt Chat Support,.

₹ 13999/- ₹ 9999/-
Buy Now
Boost your Preparation for JEE Main 2021 with Personlized Coaching
 
Exams
Articles
Questions