Two long conductors, separated by a distance  d  carry current I_{1}\; and \; I_{2}   in the same direction .They exert a force  F on each other Now the current in one of them is increased to two times and its direction is reversed. The distance is also increased to 3d . The new value of the force between them is

  • Option 1)

    -2F

  • Option 2)

    F/3

  • Option 3)

    -2F/3

  • Option 4)

    -F/3

 

Answers (1)

As we discussed in

Force between two parallel current carrying conductors -

F=\frac{\mu }{4\pi } \frac{2I_{1 I_{2}}}{a} l

\frac{F}{l}=\frac{\mu o}{4\pi } \frac{2I_{1 I_{2}}}{a}

- wherein

I1 and I2 current carrying two parallel wires 

a-seperation between two wires 

 

 

 

:\; \; \; \; \; \; \; Initially, \; \; F= \frac{\mu _{0}}{2\pi }\frac{I_{1}I_{2}}{d}l

:\; \; \; \; \; \; \; Finally, \; \; F{}'= \frac{\mu _{0}}{2\pi }\frac{\left ( -2I_{1} \right )\left ( I_{2} \right )}{3d}l

\therefore \; \; \; \; \; \; \; Finally, \; \; \frac{F{}'}{F}= \frac{-\mu _{0}}{2\pi }\; \; \frac{ 2I_{1} I_{2} l}{3d}\times \frac{2\pi d}{\mu _{0}I_{1} I_{2}l}= -\frac{2}{3}

\therefore \; \; \; \; \; \; \; {F}'= -2F/3


Option 1)

-2F

Incorrect option

Option 2)

F/3

Incorrect option

Option 3)

-2F/3

Correct option

Option 4)

-F/3

Incorrect option

Most Viewed Questions

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/- ₹ 4999/-
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/- ₹ 9999/-
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/- ₹ 2999/-
Buy Now
Knockout JEE Main May 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/- ₹ 14999/-
Buy Now
JEE Main Rank Booster 2021

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

₹ 13999/- ₹ 6999/-
Buy Now
Boost your Preparation for JEE Main 2021 with Personlized Coaching
 
Exams
Articles
Questions