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Range upto which a convex lens could have its focal length

Posted by Shreya Singh 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Drake Verma 7 years, 1 month ago

Shreya it's depends upon the type of lens u r taking we can't just tell u the max. Range of focal length of convex lens as it varies acc. To the object we r using..#Drake Verma any more queries pls ask

ANSWER

What are mirage? Give detail about it

Posted by P S 7 years, 1 month ago

CBSE > Class 12 > Physics

2 answers

Adithyan Karthik 7 years, 1 month ago

It is one of the application of Total international reflection

Yogita Ingle 5 years, 10 months ago

The mirage is caused by the total internal reflection of light at layers of air of different densities.In a desert, the sand is very hot during day time and a result the layer of air in contact with it gets heated up and becomes lighter. The lighter air rises up and the denser air from above comes down.

ANSWER

Drive of let's maker formula

Posted by Vimal Jha 5 years, 10 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Practical experiment, to find the focal length of a convex mirror using a convex lens?

Posted by Afridhi 786 7 years, 1 month ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Define interference of light. Derive an expression for fringe-width in young double slits experiment.

Posted by Sumit Kumar 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Ritik Kushwaha 7 years, 1 month ago

When two or more light move in same direction with same veocity and frequency with same or constant phase difference they superpose to each othr somewhere intensity is more and less . P=Xd/D

ANSWER

What is Zener diode?Explain its use in a voltage regulator.

Posted by Sumit Kumar 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Sunayan Paul 7 years, 1 month ago

It is a specially designed p-n junction diode which works in reverse breakdown regoin only. In zener diode doping is done heavily When current is supplied across a circuit consisting of a resistor and zener diode , increase in input current results in increase in voltage drop across resistor without any change in voltage across zener diode it is so because in reverse breakdown region zener voltage remains constant Further when input current decreases voltage across resistor decreases without any change in voltage across zener diode. Therefore it can be used as a voltage regulator?✌

ANSWER

Difference between. Permittivity and. Permeability.

Posted by Surbhi . 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Sia ? 4 years, 8 months ago

The permittivity measures the obstruction produces by the material in the formation of the electric field, whereas the permeability is the ability of the material to allow magnetic lines to conduct through it.

ANSWER

How we can measure distance cover by transmitting antena

Posted by Gurwinder Singh 7 years, 1 month ago

CBSE > Class 12 > Physics

2 answers

Shubham Kushwaha 7 years, 1 month ago

Where 'r'=radius of earth And. ' h'=height of antenna

Shubham Kushwaha 7 years, 1 month ago

d=√2rh

ANSWER

Change on charges on plates when a dielectric slab is placed between the parellel plates capacitor?

Posted by Rahul Kumar Choudhary 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Saket Kumar Suman 7 years, 1 month ago

If cap.is in closed ckt.then pot. will be constant and ch.will be dielectric constant (k)multiplied by initial ch. But cap in open ckt. Ch. will be constant it can't flow and pot.will dec. by (k) times

ANSWER

Can we skip any chapter of Physics ???

Posted by Surbhi . 7 years, 1 month ago

CBSE > Class 12 > Physics

6 answers

Aditya Roy 7 years, 1 month ago

Hey bro " Darke" i knw what you re trying to say but understand what the girl's question .is....well she is asking about is there any chapter to skip in physics but if u have idea that most of the important chapters contain high density of question in board exam..! And if she saving some time after skipping these chapter(mention below). She can give her that time to study the important chapter and we well know that there is very less day to start now...!so its better to skip that chapters "ALSO SOMETIMES SMARTWORK IS BETTER THAN USELESS HARDWORK" "Hope you all understand"?

Drake Verma 7 years, 1 month ago

Ayush raj u r telling wrong bro the chap which u recommend her to skip aur the most scoring chap which can get u a bunch of good marks in boards...but the qualitative study point is gud as this is for those who just want to pass and they don't need to study the whole chap...as by studying easy and scoring chap they can get them upto the marks...so study wisely and smart...#Drake Verma

Aditya Roy 7 years, 1 month ago

" KAM HI PARDHO PAR ACCHE SE PARDHO" Of course you can skip like communication Dual nature, necluai etc small chapters " Qualative pardhna hai quantative nhi ".

Anisha Rohilla 7 years, 1 month ago

Amandeep Kumar 5 years, 10 months ago

Yes you can skip all the chapters now. ..and try next year.?

Aryan Soni 7 years, 1 month ago

Na naaaa

ANSWER

What is base band ,Base width and fading ? Do not copy answer from google .

Posted by Surbhi . 7 years, 1 month ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Why there is no conduction of electricity through gases at normal pressure They become conductor at small pressure

Posted by Surbhi . 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Saket Kumar Suman 7 years, 1 month ago

At low press. No. of gas(atoms &molecule)are less at high press. No. of gas is more Bcoz at low pressure gases ionize and lose electron which go towards anode and due to less gas,electron do not collide(i.e. other atom can not absorb its energy)

ANSWER

Why does thermionic emission take place from metal surface only?

Posted by Surbhi . 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Yogita Ingle 7 years, 1 month ago

Because metal is a good conductor and that's why it has a large number of free electrons present. If we increases the temperature of metal body then the free electrons gains sufficient energy and comes out of the surface. For the electrons resides at the surface, the energy equal to the work function is required and for the electrons present deep inside the surface energy more tan work function is required.

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Which quantity has S.I unit faradper meter

Posted by Gudiya Yadav 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Surbhi . 7 years, 1 month ago

Permittivity

ANSWER

What is least count

Posted by Aastha Jangir 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Preeti Takhar 7 years, 1 month ago

Lowest possible reading

ANSWER

What is dielectrics and polarisation?

Posted by Vinod Bhati 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Gudiya Yadav 7 years, 1 month ago

An dielectric are the material do not conduct electricity and process to make them conductior of electricity called polarisation

ANSWER

A square loop of side 22cm is changed to a circle in time 0.4sec with its plane normal to a magnetic field 0.2T. The emf induced is

Posted by Bharti Bharti 5 years, 10 months ago

CBSE > Class 12 > Physics

1 answers

Saket Kumar Suman 7 years, 1 month ago

¢=flux(phie.) Emf=-d¢/dt or -∆¢/∆t =-(B*A(f)-B*A(i))/∆t Here,peri. Of sq.=circum. Of cir. rad of cir.=44/π cm ¢=B*A ¢final=1233.12*10^-5 app. ¢init.=968*10^-5 ∆¢=265.12*10-5 Emf=265.12*10^-5/0.4 =662.8*10^-5 Wb/sec Ans.

ANSWER

Viva questions on transformer

Posted by Naina Sharma 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Utsav Aryan 7 years, 1 month ago

There are many questions which can be asked like Working of transformer, it's principle or from the theory part. So if your theory is complete then don't worry. Everything will be fine.

ANSWER

What type of question a practical examinar can ask on project of transformer ?

Posted by Naina Sharma 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Aditya Roy 7 years, 1 month ago

Hard type questions!

ANSWER

average value of current for half cycle

Posted by Ashish Bhati 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Gudiya Yadav 7 years, 1 month ago

For AC current, Average value= 0.636×peak value of current

ANSWER

What is central force ????

Posted by Arnav Arora 7 years, 1 month ago

CBSE > Class 12 > Physics

2 answers

Sanskriti S 7 years, 1 month ago

The force which acts along the line joining the centre of two bodies

Viney Singh 7 years, 1 month ago

the force which pull outer electron

ANSWER

What are the uses of rectifier

Posted by Aryaman Singh 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Yogita Ingle 7 years, 1 month ago

Some of the applications and uses of rectifiers are in:

Appliances
Used with transformers
Soldering
AM radio
Pulse generated circuits
Signal demodulation
Voltage Multiplier

Because of the low cost compared to the center tapped, rectifier are majorly used in power supply circuits

ANSWER

How is (q1 +q2) ^2=(q1-q2)^+4q1q2

Posted by Stuti Bhatt 7 years, 1 month ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Which rectifier is there in a battery eliminator

Posted by Harsh Sharma 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Ash Thunderbird ✔ 7 years, 1 month ago

Rectifier converts AC into DC. Maybe this is the reason!

ANSWER

Two charges +4e and e are fixed 'a' distance apart. Where should a third point charge q be placed on the line joining the two charges so that it may be in equilibrium? In which case the equilibrium will be stable and unstable?

Posted by Stuti Bhatt 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Khushboo Barwar 7 years, 1 month ago

At a/3 distance from charge 'e'. Firstly for equilibrium the net forces should be zero, so try placing q at x distance from either of the charges and then take both forces to be zero. As charges are of same nature, equilibrium should be in btw the two charges 4e and e.