IIT - JEE Mains

Trending Questions and Lessons

Follow 4 Followers

Ask a Question

Feed

All

All

Lessons

Discussion

Lesson Posted on 04 Apr CBSE/Class 11/Science/Physics IIT JEE/IIT - JEE Mains/Physics/Physics and Measurement IIT JEE/IIT - JEE Advanced/Physics/Modern Physics +1 IIT JEE/IIT - JEE Advanced/Physics/Thermal Physics less

Tension in a String!

Vishesh Nigam

I am a Chemical Engineer and Khan Academy Talent Hunt Finalist (2017)(please watch my winning video below...

Tension
Comments
Dislike Bookmark

Lesson Posted on 01 Apr IIT JEE/IIT - JEE Mains/Physics/Physics and Measurement Tuition/BSc Tuition/BSc Physics CBSE/Class 11/Science/Physics +1 Tuition/Class XI-XII Tuition (PUC)/Physical Education less

Why Electric and Magnetic Field lines can not intersects??

Sandip Mandal

since tangent at any point on the field lines gives the direction of field(electric or magnetic field) so if two field lines intersects then at the intersection point we can draw two tangents from one point which is never possible since at any point only one tangent can be drawn. read more

since tangent at any point on the field lines gives the direction of field(electric or magnetic field) so if two field lines intersects then at the intersection point we can draw two tangents from one point which is never possible since at any point only one tangent can be drawn.

      

read less
Comments
Dislike Bookmark

Lesson Posted on 27 Mar Oscillations Waves IIT JEE/IIT - JEE Mains/Physics/Oscillations and Waves Electromagnetic Induction and Alternating Currents

PERIODIC MOTION AND OSCILLATORY MOTION

Kumar Kumar Sir

Earlier working with FIITJEE and Aakash about 18 years and now running an institute in The name of Kumar...

When a body repeats its motion along a definite path after regular interval of time, its motion is said to be periodic motion and interval of time is called time period (T). The path of periodic motion may be linear, circular, elliptical or any other curve. For example, the revolution of the earth... read more
  • When a body repeats its motion along a definite path after regular interval of time, its motion is said to be periodic motion and interval of time is called time period (T). The path of periodic motion may be linear, circular, elliptical or any other curve. For example, the revolution of the earth about the sun.

  • To and fro type of motion is called an oscillatory motion. It needs to periodic and has fixed extreme positions. For example, the motion of pendulum of a wall clock.

  • The force/torque directed towards equilibrium point acting in oscillatory motion is called restoring force/torque.

  • If the restoring force/torque acting on the body in oscillatory motion is directly proportional to the displacement of body and is always directed towards equilibrium position, then the motion is called simple harmonic motion (SHM). It is the simplest form of oscillatory motion.

read less
Comments
Dislike Bookmark

Lesson Posted on 27 Mar IIT JEE/IIT - JEE Mains/Physics/Oscillations and Waves Electromagnetic Induction and Alternating Currents IIT JEE/IIT - JEE Mains/Physics/Physics and Measurement

Mechanical Wave (Medium is essential)

Kumar Kumar Sir

Earlier working with FIITJEE and Aakash about 18 years and now running an institute in The name of Kumar...

Method of energy propagation, in which disturbance propagates with definite velocity without changing its form, is called a mechanical wave. Energy and momentum propagate by the motion of particles of a medium. But medium remains at the previous position; the mass transfer does not take place. Propagation... read more
  • Method of energy propagation, in which disturbance propagates with definite velocity without changing its form, is called a mechanical wave.

  • Energy and momentum propagate by the motion of particles of a medium. But medium remains at the previous position; the mass transfer does not take place.

  • Propagation is possible due to the property of medium viz. elasticity and inertia. Mechanical waves may be of two types :

read less
Comments
Dislike Bookmark

Lesson Posted on 17 Mar IIT JEE/IIT - JEE Mains/Physics/Oscillations and Waves Electromagnetic Induction and Alternating Currents CBSE/Class 12/Science/Physics Tuition/BTech Tuition/Engineering Physics

How Does Capacitor And Inductor Act When Connected With Dc Supply And Key

Kumar Kumar Sir

Earlier working with FIITJEE and Aakash about 18 years and now running an institute in The name of Kumar...

When the capacitor is connected with the dc supply and battery and the switched is on then the capacitor will act as a short circuit bit after some time when the capacitor is fully charged then it will act as an open circuit. But In case of inductor when connected with DC SUPPLY AND SWITCH then at the... read more

When the capacitor is connected with the dc supply and battery and the switched is on then the capacitor will act as a short circuit bit after some time when the capacitor is fully charged then it will act as an open circuit.

But In case of inductor when connected with DC SUPPLY AND SWITCH then at the instant when the switch is closed, will act as an open circuit due to back emf but after sometimes will act as a short circuit.

And Always remember dc supply is having ZERO FREQUENCY ALWAYS.

read less
Comments
Dislike Bookmark

Lesson Posted on 17 Mar CBSE/Class 11/Science/Physics IIT JEE/IIT - JEE Mains/Physics/Oscillations and Waves Electromagnetic Induction and Alternating Currents

What Is Power Factor.

Kumar Kumar Sir

Earlier working with FIITJEE and Aakash about 18 years and now running an institute in The name of Kumar...

It is defined as the angle between resultant current and voltage in AC circuit. it is represented by COS PHI In case of a pure resistor, the angle between the voltage and current is equal to zero hence power factor is one. In case of a pure INDUCTOR, the angle between the voltage and current is equal... read more

It is defined as the angle between resultant current and voltage in AC circuit.

it is represented by COS PHI

In case of a pure resistor, the angle between the voltage and current is equal to zero hence power factor is one.

In case of a pure INDUCTOR, the angle between the voltage and current is equal to 90 DEGREE hence power factor is ZERO.

In case of a pure CAPACITOR, the angle between the voltage and current is equal to 90 DEGREE hence power factor is ZERO.

read less
Comments
Dislike Bookmark

Lesson Posted on 06 Feb IIT JEE/IIT - JEE Mains

In A Triangle ABC, AB = AC And D Is Any Point On BC. Find BD If AB = 17cm, AD = 15cm And CD = 4cm.

Sujoy D.

1. Strong concept building classes. 2. Weekly tests in weak areas for students to improve their confidence. 3....

Solution 1: Apply cos c = (17^2 + 4^2 - 15^2)/2*17*4 = 10/17 in ADC. In ABC, cos C = ( 17^2 + (4+x)^2 - 17^2) / 2*17*(4+x) Find x. Find the angle cos C, then take BD as x. Then cos C will be same for both ADC and ABC Apply in ABC and get x.Solution 2: x=BD.Then, 1156 + 289 * x= 225(x+4) + 4*x*(x+4)... read more

Solution 1:

Apply cos c = (17^2 + 4^2 - 15^2)/2*17*4 = 10/17 in ADC.

In ABC, cos C = ( 17^2 + (4+x)^2 - 17^2) / 2*17*(4+x)

Find x.

Find the angle cos C, then take BD as x.

Then cos C will be same for both ADC and ABC

Apply in ABC and get x.

Solution 2:

x=BD.Then, 1156 + 289 * x= 225(x+4) + 4*x*(x+4) by Stewart's theorem  => x = 16.

 

read less
Comments
Dislike Bookmark

Lesson Posted on 31 Jan IIT JEE/IIT - JEE Advanced IIT JEE/IIT - JEE Mains CBSE/Class 10/Mathematics +1 Tuition/Class XI-XII Tuition (PUC) less

Derangements, Arrangement Of Things So That No Elements Appear In Their Original Place (Important for IITJEE)

Sujoy D.

1. Strong concept building classes. 2. Weekly tests in weak areas for students to improve their confidence. 3....

"Like if I have 5 tshirts and i want to gift them to my 5 cousins named A,B,C,D,E, so find number of ways in which particular cousin won't get their particular tshirts." So number of ways: D(n)=n!*(1-1/1!+1/2!-1/3!+.....(-1)^n*1/n!)) Where n is number of things which don't go to their original positionhere... read more

 "Like if I have 5 tshirts and i want to gift them to my 5 cousins named A,B,C,D,E, so find number of ways in which particular cousin won't get their particular tshirts."

So number of ways:

D(n)=n!*(1-1/1!+1/2!-1/3!+.....(-1)^n*1/n!))

Where n is number of things which don't go to their original position
here in this question n = 5

So 5!*(1-1/1!+1/2!-1/3!+1/4!-1/5)) = 44 ways in which 5 tshirts won't go to their original position

D(1) = 0

D(2) = 1

D(3) = 2

D(4) = 9

D(5) = 44

D(6) = 265 (( remember these values of Dearangements )).

read less
Comments
Dislike Bookmark

Asked on 13/12/2017 IIT JEE/IIT - JEE Mains/Mathematics/Architectural Aptitude Test

By what earth is made up of? Why it shows magnetic behavior?

Answer

Asked on 23/09/2017 IIT JEE/IIT - JEE Advanced/Chemistry/Physical Chemistry/Atomic Structure and Chemical Bonding IIT JEE/IIT - JEE Mains/Chemistry/Inorganic Chemistry Tuition/BSc Tuition/BSc Chemistry

I want to give tuition on Chemistry in B.Sc. level. I'm a student of Indian Institute of Science, Bangalore;... read more
I want to give tuition on Chemistry in B.Sc. level. I'm a student of Indian Institute of Science, Bangalore; how can I offer tuition to the students... read less

Answer

About UrbanPro

UrbanPro.com helps you to connect with the best in India. Post Your Requirement today and get connected.

Overview

Lessons 19

Total Shares  

Top Contributors

Connect with Expert Tutors & Institutes for IIT - JEE Mains

x

Ask a Question

Please enter your Question

Please select a Tag

UrbanPro.com is India's largest network of most trusted tutors and institutes. Over 25 lakh students rely on UrbanPro.com, to fulfill their learning requirements across 1,000+ categories. Using UrbanPro.com, parents, and students can compare multiple Tutors and Institutes and choose the one that best suits their requirements. More than 6.5 lakh verified Tutors and Institutes are helping millions of students every day and growing their tutoring business on UrbanPro.com. Whether you are looking for a tutor to learn mathematics, a German language trainer to brush up your German language skills or an institute to upgrade your IT skills, we have got the best selection of Tutors and Training Institutes for you. Read more