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Two identical coils of radius 10cm, each having 40 turns each are kept coaxially 10cm apart. A current 0.25A is passed through each coil. Find the magnetic field at centre of coil when currents in them flow in 1) same direction 2) opposite direction.

Posted by Anmol Gautam 6 years, 6 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

why are voltage supply 2000 instead but we are used only 220 voltage ??

Posted by Krishna Yadav 6 years, 6 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Combination of cells

Posted by Mohd Samad Mohd Samad 6 years, 6 months ago

CBSE > Class 12 > Physics

1 answers

Umesh Kumar Singh 6 years, 6 months ago

Series and parallel

ANSWER

How does the photoelectric effect support particle theory of light?

Posted by Mugha ? 6 years, 6 months ago

CBSE > Class 12 > Physics

1 answers

Gaurav Seth 6 years, 6 months ago

The photoelectric effect supports a particle theory of light in that it behaves like an elastic collision (one that conserves mechanical energy) between two particles, the photon of light and the electron of the metal.

If you shine light on a metal of any intensity with energy below the binding energy of an electron, no electrons from the metal will be ejected. As soon as the frequency of light is high enough such that the energy exceeds the binding energy, the electron from the metal can be knocked off the metal.

If the energy of the photon that hits the metal is hν, then energy will be conserved in the collision so that

hν=BE+KEelectron

The energy before the collision is hν. The minimum amount of energy needed to eject the electron is the binding energy, BE. However much hν exceeds the binding energy will be the kinetic energy KE of the ejected electron.

Conservation of energy in collisions is particle like behavior and thus the photoelectric effect supports light's particle like behavior.

ANSWER

Show that focal length (f) =radius of curvature (R) /2

Posted by Savitri Devi??? 6 years, 6 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

What is potentiometer write its principle and an expression

Posted by Hemant Narnolia 6 years, 6 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Faraday's first law

Posted by Dipsikha Bora 6 years, 6 months ago

CBSE > Class 12 > Physics

2 answers

Premesh Tyagi 6 years, 6 months ago

It is stated that the induced EMF is equal to negative rate of change of magnetic flux with respect to time

Himanshu Hada 6 years, 6 months ago

It's states that amount of chemical rxn (mass) occurs on electrode during electrolysis is equals to electricity or current pass through the process That is - M is directly proportional to ZIt Where M= mass of liberation or deposited on electrode Z= electrochemical constant I = current and T =time

ANSWER

Why does sun appear red at sunrise nd sunset

Posted by Krish Simun 6 years, 6 months ago

CBSE > Class 12 > Physics

1 answers

Ďãřşháñăã Yadav ? ? ? 6 years, 6 months ago

Colours near the red end of the spectrum scatter the least. This happens because of short wavelength of reddish colours. During sunset and sunrise, sunlight needs to travel more distance to reach us. Red colour is able to reach us because it is scattered the least. Hence, sun appears reddish during sunrise/sunset. The sun appears reddish during sunrise/sunset.

ANSWER

An iron rod of area 0.1 ²

Posted by Ramsha Malik 6 years, 6 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Meter Bridge usa

Posted by Israr Khan Israr Khan 6 years, 6 months ago

CBSE > Class 12 > Physics

1 answers

Dr.Niraj Kumar 6 years, 6 months ago

1.To know the resistance of an unknown wire 2.resistivity of that wire

ANSWER

Why is potentiometer is preferred over voltmeter to measure EMF ??? Urgent ??

Posted by Amol Gùpta 6 years, 6 months ago

CBSE > Class 12 > Physics

12 answers

Amol Gùpta 6 years, 6 months ago

Hey Rohit check out my question

Amol Gùpta 6 years, 6 months ago

Tumhara syllabus kaafi picche h cover ho jayega

Ɽøⱨł₮ ₲Ʉ₱₮₳ 6 years, 6 months ago

2 chapter from 1st part and 3 lesson from 2nd part

Amol Gùpta 6 years, 6 months ago

And what about you

Amol Gùpta 6 years, 6 months ago

First book is completed

? Natasha Yadav? 6 years, 6 months ago

How many chapters you have completed?

Amol Gùpta 6 years, 6 months ago

Tumne physics k kitne chapter kr liye

Amol Gùpta 6 years, 6 months ago

Hmmm

Ɽøⱨł₮ ₲Ʉ₱₮₳ 6 years, 6 months ago

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Amol Gùpta 6 years, 6 months ago

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Ɽøⱨł₮ ₲Ʉ₱₮₳ 6 years, 6 months ago

While a voltmeter draws a small current from the cell for its operation.So it measures the terminal p.d. in a closed circuit which is less than the emf of a cell.That is why a potentiometer is preferred over a voltmeter for measuring the emf of a cell. It help you

ANSWER

Explain cyclotron. As simple as possible...

Posted by Hariom Agrahari 6 years, 6 months ago

CBSE > Class 12 > Physics

1 answers

Gaurav Seth 6 years, 6 months ago

Cyclotron is a device to accelerate charged particles to very high speed. It employs an electric and magnetic field for the same purpose. The working of a cyclotron is based on the fact that the frequency of revolution of charged particle is not dependent on the energy.

ANSWER

Explain principal of superposition as simple as u can.

Posted by Yashwardhan Singh Parihar 6 years, 6 months ago

CBSE > Class 12 > Physics

2 answers

Himanshu Hada 6 years, 6 months ago

It's state that- 1 charge acting force on source charge is unaffected by any other charge 2 Its simply the sum of force acting by other charges on source charge(vector sum)

Yogita Ingle 6 years, 6 months ago

The superposition principle states that for a linear force system, the resultant force acting on a body is equal to the vector sum of all the individual stimulus. In Coulomb’s law the stimulus would be electrostatic force which depends upon the magnitude of charge and the distance between two charges.

ANSWER

You are required to find internal resistance of a cell in the laboratory draw a circuit diagram of the appartus you will use to determine it explain the principal

Posted by Krishan Kumar 6 years, 6 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

You

Posted by Krishan Kumar 6 years, 6 months ago

CBSE > Class 12 > Physics

1 answers

Himanshu Hada 6 years, 6 months ago

Inverse me

ANSWER

How many marks of numerical is in the exam anybody knows???

Posted by Shruti Kamal 6 years, 6 months ago

CBSE > Class 12 > Physics

1 answers

Sia ? 6 years, 6 months ago

Check here : https://mycbseguide.com/cbse-syllabus.html

ANSWER

Is mathematical expression must be occur in exam if yes then how many

Posted by Shruti Kamal 6 years, 6 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

What is a torroid

Posted by A Yadav 6 years, 6 months ago

CBSE > Class 12 > Physics

2 answers

Premesh Tyagi 6 years, 6 months ago

A solenoid band into circular loop is known as steroid

Ďãřşháñăã Yadav ? ? ? 6 years, 6 months ago

The toroid is a hollow circular ring on which large no. of turns of a wire are closely wound. B= μοNI/2πr.

ANSWER

KBL &KCL wheat stone bridge and meter bridge explain

Posted by Vinu Yadav 6 years, 6 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

What is parellex

Posted by Pankaj Yadav 6 years, 6 months ago

CBSE > Class 12 > Physics

1 answers

Yogita Ingle 6 years, 6 months ago

Parallax is a method of measuring distance to an object. Similar to how our binocular vision helps us determine distance, the direction to a distant point is slightly different from two separate observation positions. If the distance between the observation positions is known, and the angle between them can be measured, it is a matter of simple geometry to calculate the distance to the object. It is a relatively simple concept but is one of the most important for making astronomical observations.

ANSWER

Definition of drift velocity

Posted by Uzaif Khan 6 years, 6 months ago

CBSE > Class 12 > Physics

3 answers

Premesh Tyagi 6 years, 6 months ago

The average velocity with which free electron move in a conductor on application of potential difference is called velocity

Aastha Saxena 6 years, 6 months ago

The average velocity by which electrons move towards the positive end of the conductor due to electrostatic force is called drift velocity

Akhil Rock 6 years, 6 months ago

Average velocity acquired the electron flowing in opposite direction of magnetic field

ANSWER

Plz give me the syllabus of physics ch7 ncert topic wise

Posted by Riya Chaudhary 6 years, 6 months ago

CBSE > Class 12 > Physics

2 answers

Harshit Siddhu 6 years, 6 months ago

2.Average of AC over a full cycle

Harshit Siddhu 6 years, 6 months ago

1.Average of AC over a half cycle

ANSWER

Can there is any situation when we covered the small distance like 1m with speed of light then the time taken to cover 1m is 0 or not

Posted by Ritik Yadav 6 years, 6 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Define mutual inductance ?

Posted by Rahul_ Ry(ʘ‿ʘ) 6 years, 6 months ago

CBSE > Class 12 > Physics

1 answers

Shivam Chaurasia 6 years, 6 months ago

Property of a primary coil to opposes the flow of induced current in secondary coil and vice ve rsa

ANSWER

Statement of Gauss law or theorem

Posted by Ɽøⱨł₮ ₲Ʉ₱₮₳ 6 years, 6 months ago

CBSE > Class 12 > Physics

44 answers

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Physics

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Amol Gùpta 6 years, 6 months ago

electric field in a closed surface is directly proportional to the enclosed electric charge. ... Yet another statement of Gauss's law states that the net flux of a given electric field through a given surface, divided by the enclosed charge should be equal to a constant. Hope it will help you !!!

ANSWER

Faraday 1 st law

Posted by Varun Kumar 6 years, 6 months ago

CBSE > Class 12 > Physics

2 answers

Aastha Saxena 6 years, 6 months ago

When magnetic flux link through the coil is changed then there is induced current or induced emf produced in the coil.this was called faraday 1st law

Yogita Ingle 6 years, 6 months ago

Faraday First Law of Electrolysis

It is one of the primary laws of electrolysis. It states, during electrolysis, the amount of chemical reaction which occurs at any electrode under the influence of electrical energy is proportional to the quantity of electricity passed through the electrolyte.

ANSWER

What is cyclotron??

Posted by Surbhi Verma 6 years, 6 months ago

CBSE > Class 12 > Physics

2 answers

Umesh Kumar Singh 6 years, 6 months ago

It is suitable for accelerating heavy charged particles such as protons,alpha particles and positive ions

Ďãřşháñăã Yadav ? ? ? 6 years, 6 months ago

cyclotron is a device which is used to accelerate +ve charge particle with high acceleration.

ANSWER

A magnetic needle lying Parallel to a magnetic field requires W unit to turn it through 60°. what is the torque needed to maintain the needle in those position?

Posted by Řøhăň Řąjpůť ✌️✊ 6 years, 6 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

What is the difference between electric field and electric field line

Posted by Parul Rajput 6 years, 6 months ago

CBSE > Class 12 > Physics

4 answers

Yash Barnwal 6 years, 6 months ago

Electric field is the region or space around the charged particle due to which its force experienced by the another unit test charge Electric lines are hypothetical curve lines in which tangent of any line gives the direction of magnetic field

Pradhum Parashar 6 years, 6 months ago

The field around a charge or we say produce by charge is called electric field whearas the line passed through these field called electric field line

Aadi Ahluwalia 6 years, 6 months ago

Na bhai its wrong sanju yadav ko kuch nhi aata

Sanju Yadav 6 years, 6 months ago

They are same

ANSWER

Why the field of an electric dipole is zero.

Posted by Parul Rajput 6 years, 6 months ago

CBSE > Class 12 > Physics

1 answers

Pradhum Parashar 6 years, 6 months ago

Because of charge are opposite and makes opposite electric field to the poient charge and hence net ef is zero

ANSWER

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