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  • 1 answers

Yogita Ingle 15 hours ago

The self-inductance of the coil depends on its geometry and on the permeability of the medium. The self-induced emf is also called the back emf as it opposes any change in the current in a circuit. Physically, the self-inductance plays the role of inertia. It is the electromagnetic analogue of mass in mechanics. So, work needs to be done against the back emf (ε) in establishing the current. This work done is stored as magnetic potential energy

  • 1 answers

Gaurav Seth 1 day, 1 hour ago

On July 7, HRD Minister Ramesh Pokhriyal announced a major CBSE syllabus reduction with 30% of the syllabus slashed for the year 2020-21 for classes 9 to 12 because of the reduction in classroom teaching time due to the Covid-19 pandemic and lockdown.

CBSE has rationalized the syllabus with the help of suggestions from NCERT and the same has been notified by a new CBSE notification as well.

Click on the given link:

<a data-toggle="collapse" href="">Revised Senior Secondary Curriculum (XI-XII)</a>

  • 1 answers

Mohsin Raza 1 day, 12 hours ago

How we can help only you have to work hard
  • 4 answers

Rounik Roy 1 day ago

It's better to read long question shorts and very short will automatic done. ☺☺☺☺ nhi app 😅😅

Tanya 💖💖 1 day, 11 hours ago

I think u should try from Byju's....maine bhi kie the ek baar bio k ch 1 I jb mera bio ka UT tha .....aache questions hote h I recommend u that channel 👍👍

Mohsin Raza 1 day, 12 hours ago

No app purchase ulike or exam idea
  • 1 answers

Yogita Ingle 2 days, 11 hours ago

Spherical Wavefront

  • When the source of light is a point source the wavefront formed will be spherical wavefront.
  • Point source means the source of light is so small that it is considered as point. It can be considered as dimensionless.
  • For example: - Ripples in water are in the form of concentric circles which are spherical wavefronts.
  • 2 answers

Gaurav Seth 2 days, 21 hours ago


Charge of each nucleus = 29e

∴ Net charge 2 gm sphere = (29e) × (2 × 1022) = 5.8 × 1023e c.

∴ No of electrons on sphere = 5.8 × 1023

∴ No of electrons removed to give 2μc charge

= (q/e)

= [(2 × 10–6)/(1.6 × 10–19)]

= 1.25 × 1013

∴ fraction of electrons removed = [(1.25 × 1013)/(5.8 × 1023)]

= 2.16 × 10–11

Gaurav Seth 2 days, 21 hours ago

A copper sphere of mass 2 g contains nearly 2 x 1022 atoms. The charge on the nucleus of each atom is 29 e. What fraction of the electrons must be removed from the sphere to give it a charge of +2 μC?

<hr />

Total number of electrons in the sphere = 29 x 2 x 1022

  • 1 answers

Mohsin Raza 3 days, 13 hours ago

Iska matlab sirf basic level ka
  • 4 answers

Sourabh Yadav 1 day, 13 hours ago

Yes 20 marks are held by our school teacher

Mahendra Rathor 3 days, 14 hours ago

obviously yes

..... . 4 days ago


Sonu Anshul 4 days, 9 hours ago

तुम पागल
  • 1 answers

Yogita Ingle 4 days, 15 hours ago

<article data-post-id="9561" data-topic-id="7857" data-user-id="49" id="post_2">

The EM waves are produced by the accelerated charge. The electron jumping from its outer to inner orbits radiates EM waves. These EM waves are propagated as electric and magnetic fields oscillating in mutually perpendicular directions which is cause of momentum and energy.

  • 2 answers

Harsh Tiwari 12 hours ago

The electrostatic potential at point in an electric field is the amount of work done in moving a unit positive charge from infinite to the point against the electrostatic force

Gaurav Seth 4 days, 23 hours ago

 Electrostatic Potential : The electrostatic potential at any point in an electric field is equal to the amount of work done per unit positive test charge or in bringing the unit positive test charge from infinite to that point, against the electrostatic force without acceleration.

  • 2 answers

Ruhi Khan 4 days, 15 hours ago

When electopositve ion add and electonegative ion is loose is known as reduction

Lalit Jakhar 5 days, 1 hour ago

Gain of electron is known as reduction.
  • 0 answers
  • 1 answers

Yogita Ingle 5 days, 6 hours ago

In an experimental set up for photoelectric effect, the value of negative potential of collector plate or anode at which the photoelectric current will reduce to zero is called stopping potential (V0​) for the given frequency of incident radiation.    

  • 2 answers

Sourabh Yadav 1 day, 13 hours ago

Yes ,our earth is considered as equipotential surface

Tanya 💖💖 5 days, 10 hours ago

  • 2 answers

Tanya 💖💖 5 days, 12 hours ago

May be...kyuki hamare teachers bhi keh rhe the..

Devil 😎 5 days, 23 hours ago
  • 1 answers

Gaurav Seth 6 days, 13 hours ago

Consider a ring of radius 'a' which carries uniformly distributed positive total charge Q. 

To find: electric field due to a ring at a point P lying at a distance x from its centre along the central axis perpendicular to the plane of the ring.

As the charge is distributed uniformly over the ring, the charge density over the ring is, 

The perpendicular component of electric field due to charge on the ring along the x-axis cancels each other out.

As there is same charge on both sides of the ring, the magnitude of the electric field at P due to the segment of charge dQ is given by, 

dE = ke 
Ex =  


1. At the centre (X = 0) , electric field is zero. 

2. When x>> a, a can be neglected in the denominator. 



  • 0 answers
  • 1 answers

Devil 😎 5 days, 23 hours ago

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  • 1 answers

Gaurav Seth 1 week ago

Given an electric dipole placed in a non-uniform electric field. An electric dipole always experiences a torque when placed in uniform as well as non-uniform electric field. But in non-uniform electric field, dipole will also experience net force of attraction. So the electric dipole in non-uniform electric field experiences both torque and force.

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