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Lesson Posted on 31 Jan IIT JEE/IIT - JEE Advanced/Physics/Modern Physics Tuition/Class XI-XII Tuition (PUC)/Physics

Why There Is A Bigger Hole (Compare To Other Two) In A Electric Socket?

Sujoy D.

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

Point 1: For case for ground pin. Also ground pin is larger that other two pins so that it would be the first to go into the hole and the last to come out of the hole just for sake of safety Point 2: This is done to prevent the user from accidentally inserting the live or neutral pin into the ground... read more

Point 1: For case for ground pin. Also ground pin is larger that other two pins so that it would be the first to go into the hole and the last to come out of the hole just for sake of safety

Point 2: This is done to prevent the user from accidentally inserting the live or neutral pin into the ground pin.

Point 3: It is because of simple thing:

i. If all are same sized then you will have 3 choices to plug in but every time you will not make it right so you get confusion.

ii. In order to eliminate that one of them is bigger than remaining ones so that every time you plugin you will get supply even if you use 2 pin plug.

Point 4: R proportional to L/A. So larger the cross sectional area lesser the resistance!  So with less resistance in case of fault all the current will pass through that pin(which is the ground) and make no harm to your circuit! Basically its for electrical safety!

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Lesson Posted on 02 Feb IIT JEE/IIT - JEE Advanced/Mathematics/Analytical geometry (2 dimensions)

Plane Analytic Geometry

Raj Kumar

I am Six Sigma Black belt certified. I am 2011 pass out in B.tech from NIT Srinagar. I am an experienced,...

The curves that we learn about in this chapter are called conic sections. They arise naturally in many situations and are the result of slicing a cone at various angles. Depending on where we slice our cone, and at what angle, we will either have... read more

                                                    conic section - ellipse

The curves that we learn about in this chapter are called conic sections. They arise naturally in many situations and are the result of slicing a cone at various angles.

Depending on where we slice our cone, and at what angle, we will either have a straight line, a circle, a parabola, an ellipse or a hyperbola. Of course, we could also get a single point, too.

Why study analytic geometry?

Science and engineering involves the study of quantities that change relative to each other (for example, distance-time, velocity-time, population-time, force-distance, etc).

It is much easier to understand what is going on in these problems if we draw graphs showing the relationship between the quantities involved.

The study of calculus depends heavily on a clear understanding of functions, graphs, slopes of curves and shapes of curves. For example, in the Differentiation chapter we use graphs to demonstrate relationships between varying quantities.

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Lesson Posted on 16 Jan Tuition/Class XI-XII Tuition (PUC)/Physics IIT JEE/IIT - JEE Advanced/Physics/Modern Physics

How To Solve A Mechanics Problem?

Satya Reddy

I have graduated from IIT Kharagpur from Civil Engineering Discipline. I have been working for Ola Cabs...

Solving a mechanics problem especially at JEE level is all about getting into right thinking framework. Step 1: Picking a frame of reference. It can be solved from inertial frame of reference or non-nertial frame of reference (where a pseudo force acts). Step 2: Divide the problem into small parts... read more

Solving a mechanics problem especially at JEE level is all about getting into right thinking framework. 

Step 1: Picking a frame of reference. It can be solved from inertial frame of reference or non-nertial frame of reference (where a pseudo force acts).

Step 2: Divide the problem into small parts and then draw the free body diagrams.

Step 3: Use the Newton's 3 Laws to write the equations.

Step 4: Solve the equations to get the answer.

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Asked on 16 Jan IIT JEE/IIT - JEE Advanced/Physics/Modern Physics

Is self induced emf in an inductor will be equal and opposite to the applied voltage? If yes then why... read more

Is self induced emf in an inductor will be equal and opposite to the applied voltage? If yes then why current flow in the circuit?

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Asked on 10 Jan IIT JEE/IIT - JEE Advanced

As the JEE Exam is approaching, so when will be the JEE Advance Form released for 2018?

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Asked on 13/12/2017 IIT JEE/IIT - JEE Advanced/Physics/Modern Physics

A circular current carrying coil as a radius R. The distance from the center of the coil on the axis... read more
A circular current carrying coil as a radius R. The distance from the center of the coil on the axis where magnetic induction will be 1/8th of its value at the center of the coil is.____________. read less

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Asked on 13/12/2017 IIT JEE/IIT - JEE Advanced/Physics/Modern Physics

A long straight metal rod has a very long hole of radius 'a' drilled along parallel to the rod axis.... read more
A long straight metal rod has a very long hole of radius 'a' drilled along parallel to the rod axis. if rod carries a current 'i' the value of magnetic induction on the axis of hole where oc=c _________________. read less

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Lesson Posted on 12/10/2017 IIT JEE/IIT - JEE Advanced Exam Coaching/Engineering Entrance Coaching/GATE Coaching

Steady Magnetic Field

Debrup Bhattacharya

Training students in Physics (and related mathematics) for IIT-JEE/NEET(then AIEEE) since 2007. Qualified...

1. i. State Ampere's circuit law. ii. A hollow conducting cylinder has inner radius a and outer radius b and carries current I along the positive z-direction. Find H everywhere. 2. Find H at the center C of an equilateral triangular loop of side 4 m carrying 5 A of current. 3. A thin plastic disk... read more

1. i. State Ampere's circuit law.

ii. A hollow conducting cylinder has inner radius a and outer radius b and carries current I along the positive z-direction. Find H everywhere.

2. Find H at the center C of an equilateral triangular loop of side 4 m carrying 5 A of current.

3. A thin plastic disk of radius R has a uniform charge density. The disk is rotating about its axis with an angular speed. Find the magnetic field along the axis of the disk at a distance z from the centre.

4. Two parallel current carrying wires of length L and mass m per unit length each are suspended from the ceiling by means of massless strings of length l each. The wires carry equal currents in opposite directions. If the angle between the wires suspended from the same point is θ, obtain an expression for the current flowing in each wire in terms of the given quantities.

5. i. A filamentary loop carrying current I is bent to assume the shape of a regular polygon of n sides. Circumscribing a circle of radius r. Find H at the centre of the polygon.

ii. Show that if n approaches infinity, the result obtained is the same as that of a circle.

6. A massless conducting rod of resistance R lies on two perfectly conducting horizontal rails separated by a distance d on a table, at one end the rods are connected by a conducting wire. A vertically upward magnetic field B exists in the region. If the rod is connected by a pulley arrangement which supports a mass m which falls down as the rod moves outward on the rails. Calculate the terminal velocity of the mass.

7. Arrive at Maxwell's corrections to Ampere's Law. Explain its significance and hence arrive at the wave equation for EM Waves.

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Lesson Posted on 12/10/2017 IIT JEE/IIT - JEE Advanced Exam Coaching/Engineering Entrance Coaching/GATE Coaching

Magnetism MCQ

Debrup Bhattacharya

Training students in Physics (and related mathematics) for IIT-JEE/NEET(then AIEEE) since 2007. Qualified...

1. One of the following is not a source of magnetostatic fields: a. A dc current in a wire. b. A permanent magnet. c. An accelerated charge. d. An electric field Linearly changing with time. e. A charged disk rotating at uniform speed. 2. Which of these statements is not characteristic of a static... read more

1. One of the following is not a source of magnetostatic fields: 

a. A dc current in a wire.

b. A permanent magnet.

c. An accelerated charge.

d. An electric field Linearly changing with time.

e. A charged disk rotating at uniform speed.

2. Which of these statements is not characteristic of a static magnetic field?

a. It is solenoidal.

b. It is conservative.

c. It has no sinks or sources.

d. Magnetic flux lines are always closed.

e. The total number of flux lines entering a given region is equal to the total number of flux lines leaving the region.

3. Two identical circular coaxial coils carry current I in opposite directions. The magnetic field H at a point on the axis, midway between the coils is:

a. Zero.

b. The same as that produced by one coil.

c. Twice that produced by one coil.

d. Half that produced by one coil.

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Asked on 18/09/2017 IIT JEE/IIT - JEE Advanced

Where can I get the JEE Mains 2018 exam's paper pattern? Please help.

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