CBSE > Class 12 > Physics | CBSE Board | Homework Help

Dekh bro simple wrds mein ye samjh ki jo electricity is a source of energy and we can't create energy so we have to change ur mechanical energy to convert into other form of energy and agar energy conservation Nahi hota n isme to hum bs ek bada sa magnet coil ke samne rakh kr jevan bhar energy lete bina kisi work done ke ...i hope this help a little

0Thank You

Khushi Singh 6 years, 4 months ago

It is mechanical work done in moving the magnet with respect to time the coil changes that energy into electrical energy so we can say that lenz's law support the law of conservation of energy.

2Thank You

ANSWER

There are two charges of +4 micro coulomb and + 2 micro coulomb separated by a distance of 0.1m in air.Find the ratioof the forces acting on them.

Posted by Khushi Singh 6 years, 4 months ago

CBSE > Class 12 > Physics

2 answers

Raman Kant 6 years, 4 months ago

Shyd

0Thank You

Raman Kant 6 years, 4 months ago

-1 is the ans

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ANSWER

Popositive and negative charges of equal magnitudes are kept at (0,0,a/2) and (0,0,-a/2) respectively the work done by the electric field when another positive charge is moved from (-a,0,0) to (0,a,0)

Posted by Yash Sharma 6 years, 4 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

The heat produced by 100W heater in 2min is equal to ?

Posted by Deepika Panwar 6 years, 4 months ago

CBSE > Class 12 > Physics

1 answers

Ankit Kumar 6 years, 4 months ago

H = I2RT H=pt H=100×120=12000 J /12 KJ

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ANSWER

When will exam start? Anyone knows?

Posted by Megh Anand 6 years, 4 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Why electric field does not interact each other?

Posted by Prashant Gupta 6 years, 4 months ago

CBSE > Class 12 > Physics

2 answers

Harsh Rana 6 years, 3 months ago

Becoz if they intesect each other then they will show two directions at point of interaction which is not possible

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Heena Pathak 6 years, 4 months ago

Bcoz at the point of interaction 2 tangents are drawn which shows 2 direction of electric field which is not possible

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ANSWER

Why must electrostatic field at the surface od a chaeged conductor be perendicular to every point on it

Posted by Raashi Singh 6 years, 4 months ago

CBSE > Class 12 > Physics

1 answers

Sia ? 6 years, 4 months ago

As the electric field inside a conductor is always zero. The electric lines of forces exert lateral pressure on each other which leads to repulsion between like charges. Thus, in order to stabilize spacing, the electric field lines are normal to the surface. Other reason can also be defined as if the electric field lines are not perpendicular to the surface there will be a tangential component of electric field along the surface which forces charge to move along the circumference due to which potential will not remain same on the surface.

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By which online platform using i can complete my whole syllabus of physics up to last week of november with crystal clear concept

Posted by Harshit Kumar 6 years, 4 months ago

CBSE > Class 12 > Physics

1 answers

Subhra Mishra 6 years, 4 months ago

BABA GANG

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ANSWER

Definition of magnetic indclination

Posted by Echan Ningthwza 6 years, 4 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

,what is mutual inductance

Posted by Asheesh Sachan 6 years, 4 months ago

CBSE > Class 12 > Physics

3 answers

Vikas Semwal 6 years, 4 months ago

if there are two solenoid..... solenoid 1 and solenoid 2 and the current passes through solenoid 1 produces magnetic field in the second solenoid and due to this, current induced in the second solenoid and this phenomena is known as mutual inductance

1Thank You

Koustubh Choudhary 6 years, 4 months ago

Mutual inductance is a phenomenon which occurs when flux (magnetic) changes in secondary coil due to the change in primary coil...

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Yogita Ingle 6 years, 4 months ago

Mutual Inductance

In mutual inductance there are 2 coils, current is passed in one coil, as current increases there is change in the flux, and as aresult current is induced in the second coil.

Consider coil 1 connected to battery and coil 2 is connected to the galvanometer.

When the key is pressed attached to the coil 1 the current starts flowing, when the current starts increasing flux linked also starts increasing.
Because of the increase in the flux linked with the coil1, the flux of coil 2 also increases.
There is change in the flux of the coil 2 as a result emf is induced in the coil 2.
Because of the induced emf induced current will be there in coil2.
This induced current opposes the increase of the current in coil 1.

1Thank You

ANSWER

Van degram generator is in syllabus

Posted by Krishna Jasawat 6 years, 4 months ago

CBSE > Class 12 > Physics

3 answers

Rajinder Singh 6 years, 4 months ago

1Thank You

Pragati Saini 6 years, 4 months ago

No its not included in our syllabi

1Thank You

Khushi Singh 6 years, 4 months ago

1Thank You

ANSWER

Relate the phenomenon of charging of body with daily life

Posted by Kanak Sharma 6 years, 4 months ago

CBSE > Class 12 > Physics

1 answers

Khushi Singh 6 years, 4 months ago

While combing

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ANSWER

Anyone can send me d prism detivation

Posted by Ayaan Ali ?? 6 years, 4 months ago

CBSE > Class 12 > Physics

1 answers

Pragati Saini 6 years, 4 months ago

Prism derivation is detucted from our syllabi

0Thank You

ANSWER

Van degraff generator is in syllabus??

Posted by Sourav Singh 6 years, 4 months ago

CBSE > Class 12 > Physics

3 answers

Ron Vineetahuja 6 years, 4 months ago

No it is in our syllabus

0Thank You

Sourav Singh 6 years, 4 months ago

Okk thnku

1Thank You

Pragati Saini 6 years, 4 months ago

No.. its not in our syllabi

0Thank You

ANSWER

What are the advantages and disadvantages of transformer

Posted by Anuj Rawal 6 years, 4 months ago

CBSE > Class 12 > Physics

2 answers

Pragati Saini 6 years, 4 months ago

The main disadvantage of an autotransformer is that it does not have the primary to secondary winding isolation of a conventional double wound transformer. Then an autotransformer can not safely be used for stepping down higher voltages to much lower voltages suitable for smaller loads.

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Pragati Saini 6 years, 4 months ago

It has the advantage of preventing condensed flux leakage and iron loss. When it comes to its lamination, the one in a core type transformer is typically arranged to create an overlapping joint with an extra pair of laminations to make for an accurate core thickness.

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ANSWER

Where the practical of physics held on?

Posted by Sandeep Singh 6 years, 4 months ago

CBSE > Class 12 > Physics

2 answers

Anand Tiwari 6 years, 4 months ago

Only for Delhi students practical conduct any other school

0Thank You

Isha Raj 6 years, 4 months ago

the centre would be given in any other school

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ANSWER

Magnetic field due to current through a very long circular cylinder

Posted by Khushi Singh 6 years, 4 months ago

CBSE > Class 12 > Physics

1 answers

Vikas Semwal 6 years, 4 months ago

Mu naught ×i÷2πr.

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ANSWER

When (B) and (dl) are acting in same direction why should we take cos 0 degree

Posted by Khushi Singh 6 years, 4 months ago

CBSE > Class 12 > Physics

1 answers

Isha Raj 6 years, 4 months ago

when two lines act in same direction then ofcourse the angle between them is 0 degree...as they seem to be parallel...so...

1Thank You

ANSWER

Two persons manage to push a motor car of mass 1200 kg at a uniform velocity along a level road. This a motor car can be pushed by three persons to produce an acceleration of 0.2 metre per second square. With what force does each person push the motor car ? ( Assume that all persons push the motorcar with same muscular effort)

Posted by Chinta Keerty 6 years, 4 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Thanks

Posted by Anurag Poya 6 years, 4 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

What is difference b/w 1. Vrms and Veff 2. Erms and Eeff And how to identify which is given in numericals

Posted by King Manan Jain 6 years, 4 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

The elect field of a plane EMWave travelling +z direction is described by

Posted by Pawan Chaudhary 6 years, 4 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Kaise mai 3 month me self study kru board exam ke liye

Posted by Anchal Pandey 6 years, 4 months ago

CBSE > Class 12 > Physics

5 answers

Anchal Pandey 6 years, 4 months ago

Above 80%

0Thank You

Rajinder Singh 6 years, 4 months ago

Depend on Waheguru and do hardwork

1Thank You

Anish Kumar 6 years, 4 months ago

first make time table and follow it

1Thank You

Pawan Chaudhary 6 years, 4 months ago

What's your goal in board?

3Thank You

Arpit Kushwaha 6 years, 4 months ago

First makes a time table and follow sincerely..

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ANSWER

How i complete my syllabus by self study and by vedio lectures. ...??

Posted by Harshit Kumar 6 years, 4 months ago

CBSE > Class 12 > Physics

1 answers

Řøhăň Řąjpůť ✌️✊ 6 years, 4 months ago

bro u can score gud by self study and it's a gud idea.. Just do consistent study. Just make sure ur concept as well as Base should be clear no matter which reference u are opting. go through with gud vedio lectures. solve ncert + 10 year sample paper. hope it may help. Best of luck bro ?

7Thank You

ANSWER

Ray optics is there in syllabus

Posted by Pratik Rai Rai 6 years, 4 months ago

CBSE > Class 12 > Physics

7 answers

Khuskaran Sidhu 6 years, 4 months ago

Yah‼ it is

0Thank You

Rizwana Multani 6 years, 4 months ago

Yes

1Thank You

Adaa Galhotra 6 years, 4 months ago

Yeeaaaahhhh!!! Acc to new syllabus prescribed by cbse its there in syllabus

0Thank You

Arpit Kushwaha 6 years, 4 months ago

Yes

0Thank You

Řøhăň Řąjpůť ✌️✊ 6 years, 4 months ago

yes it is in the syllabus

1Thank You

Shikha Maurya 6 years, 4 months ago

Yes

0Thank You

Garima Kimothi 6 years, 4 months ago

Yeahh

0Thank You

ANSWER

Wurtz reaction

Posted by Robin Singh 6 years, 4 months ago

CBSE > Class 12 > Physics

3 answers

Khuskaran Sidhu 6 years, 4 months ago

Ch3cl + na dry ether--> ch3ch3

1Thank You

Shikha Maurya 6 years, 4 months ago

R-X+2Na+R-X(dry ether)=R-R+2NaX

1Thank You

Shikha Maurya 6 years, 4 months ago

When alkyl halides react with sodium metal in dry ether to give hydrocarbon containing double the number of carbon atoms present in the halide. R-X+2Na+R-X=R-R+2Na

1Thank You

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