If in the circuit, power dissipation is 150 W, then R is

  • Option 1)

    2\Omega \;

  • Option 2)

    \; 6\Omega\;

  • Option 3)

    \; \; 5\Omega\;

  • Option 4)

    \; 4\Omega

 

Answers (2)

As we learnt in 

if R=r -

P_{max}=\frac{E^{2}}{4r}

- wherein

Power delivered will be maximum

 

 and

 

Parallel Grouping -

Potential - Same

Current - Different

- wherein

 

The equivalent resistance is Re_{2}= \frac{2\times R}{2+R}

Power dissipation P= \frac{v^{2}}{R}

150 = \frac{15\times 15}{Re_{2}}

= Re_{2} = \frac{15}{10}= \frac{3}{2}

\frac{2R}{2+R} = \frac{3}{2}

\Rightarrow 4R = 6+3R

R = 6\Omega

 

 

 

 

 


Option 1)

2\Omega \;

This option is incorrect.

Option 2)

\; 6\Omega\;

This option is correct.

Option 3)

\; \; 5\Omega\;

This option is incorrect.

Option 4)

\; 4\Omega

This option is incorrect.

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