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

The e.m.f of a cell is always greater than it's terminal voltage because e.m.f is the potential difference across the two terminals when it is not connected to any circuit, And Of this connects to the circuit the voltage automatically gets reduced because of the internal resistance

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ANSWER

Section 1 se ka sara set me question same rhega or sirf juble krega ????????????

Posted by Zafarul Hasan 5 years, 7 months ago

CBSE > Class 12 > Physics

2 answers

Saurabh Sharma 5 years, 7 months ago

No questions might be changed

1Thank You

Group Gpt 5 years, 7 months ago

Dont know because iss patern par pehli bar paper hai

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ANSWER

Is derivation of magnification of artronomical telescope in our course ??? Or only formula..is there....???

Posted by Abc ?⏳ 5 years, 7 months ago

CBSE > Class 12 > Physics

5 answers

Saurabh Sharma 5 years, 7 months ago

Only formula will come and diagram acc.. to me

0Thank You

Ishika Soni 5 years, 7 months ago

both

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Group Gpt 5 years, 7 months ago

Both

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Ashish Ranjan 5 years, 7 months ago

Derivation telescope ka aa skta hai along with diagram

1Thank You

Jk Verma 5 years, 7 months ago

Both

1Thank You

ANSWER

Displacement current dervation

Posted by S Shekhar 5 years, 7 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Why semiconductors obey ohms law only at low field??????

Posted by Shivam Yadav 5 years, 7 months ago

CBSE > Class 12 > Physics

2 answers

Amol Gùpta 5 years, 7 months ago

This happens because at low temperature, the "p" and "n" type semiconductor resist the flow of electrons through them and then act as resistances, but when the temperature is increased the flow of electrons is Hindered.

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Tapan Pandey ?? 5 years, 7 months ago

Ab yeh toh ohms law hi batayega.....

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ANSWER

heating effect syllabus m nhi h kya

Posted by Ishika Soni 5 years, 7 months ago

CBSE > Class 12 > Physics

3 answers

Aayush Garg 5 years, 7 months ago

Haa It is an irreversible process

0Thank You

Ashish Ranjan 5 years, 7 months ago

Wo sab se question nahi ayega

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Tapan Pandey ?? 5 years, 7 months ago

Haa...

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Magnetic field ke imp question or derivation BTA do

Posted by Aayush Garg 5 years, 7 months ago

CBSE > Class 12 > Physics

4 answers

Ashish Ranjan 5 years, 7 months ago

Great ?

1Thank You

Tapan Pandey ?? 5 years, 7 months ago

She is right...

1Thank You

Ishika Soni 5 years, 7 months ago

jitne v applications uspar based numericals aate h ...so just see it

3Thank You

Ishika Soni 5 years, 7 months ago

biot savart law..ampere circuital..dono k applicatiions..solenoid..toroid..force btwn parallel current carrying conductor cyclotoron

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ANSWER

in ray optics which one is very very imp topics..95 percent to come in exm...????

Posted by Ishika Soni 5 years, 7 months ago

CBSE > Class 12 > Physics

10 answers

Ďãřşháñăã Yadav ? ? ? 5 years, 7 months ago

??vo toh nhi milega. result wale din bta dungi.

0Thank You

Tapan Pandey?? 5 years, 7 months ago

Jb aap mere 2. Question ka answer do ge???

1Thank You

Ďãřşháñăã Yadav ? ? ? 5 years, 7 months ago

abb apko kese lagega. ??

1Thank You

Tapan Pandey?? 5 years, 7 months ago

Humko toh aisa ni lg raha. ...

2Thank You

Ďãřşháñăã Yadav ? ? ? 5 years, 7 months ago

glt femi hai apki kuch prepare nhi hua ???

1Thank You

Group Gpt 5 years, 7 months ago

Optical insteuments are most important

0Thank You

Tapan Pandey ?? 5 years, 7 months ago

@Darshana..........Good ....lg rha preparation khatam ???

1Thank You

Lakshya ? 5 years, 7 months ago

Lens maker formula...most probably

1Thank You

Amol Gùpta 5 years, 7 months ago

Thanks mujhe Bhi jarurat thi

3Thank You

Ďãřşháñăã Yadav ? ? ? 5 years, 7 months ago

umm! lens maker formula, TIR, refraction through glass prism and minimum deviation, optical instrument Ray diagram and numerical.

7Thank You

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from semicondoctor both amplifier and transistor are out of syllabus na..? plse help

Posted by Ishika Soni 5 years, 7 months ago

CBSE > Class 12 > Physics

5 answers

Arsh Sidhu 5 years, 7 months ago

Yeah

0Thank You

Saurabh Sharma 5 years, 7 months ago

Yes of course

0Thank You

Group Gpt 5 years, 7 months ago

Pakam pakaa

0Thank You

Tapan Pandey ?? 5 years, 7 months ago

Bilkul.....

0Thank You

Shefu ??????? 5 years, 7 months ago

Yes

2Thank You

ANSWER

is thermistor and supercondictivity in syllabus or not??

Posted by Ishika Soni 5 years, 7 months ago

CBSE > Class 12 > Physics

2 answers

Group Gpt 5 years, 7 months ago

Superconductivity is given in ncert so it can come

0Thank You

Tapan Pandey ?? 5 years, 7 months ago

Ni hai

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ANSWER

Ncert exampler ke mcq board mai ate hai kya? ?

Posted by Yakuza Shimatoro 5 years, 7 months ago

CBSE > Class 12 > Physics

3 answers

Ashish Ranjan 5 years, 7 months ago

Ha lekin ab wo sab book ko preference mat do only notes nd previous years question

0Thank You

Tapan Pandey ?? 5 years, 7 months ago

May be ...

0Thank You

Aayush Garg 5 years, 7 months ago

Yes

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ANSWER

An electric lamp runs at a.c. and consumes 12amperes .it is connected to 220v ,50hz a.c.find the value of inductance required nd the factor

Posted by Priya Yagik 5 years, 7 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Two identical parallel plate capacitors A and B are connected to a battery of V volts with the switch S closed.the switch is now opened and the free space between the plates of the capacitor is filled with a dielectric constant k . Find the ratio of the total electrostatic energy stored in both capacitors before and after the introduction of the dielectric

Posted by Sreya.P Pavithran 5 years, 7 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

How to convert full wave rectifier to half wave rectifier and vice versa by changing connection??

Posted by Sukh Preet 5 years, 7 months ago

CBSE > Class 12 > Physics

1 answers

Abc ?⏳ 5 years, 7 months ago

In this u hv to just explain both rectifiers seperately....its phy sample paper ques..u can see cbse solution....

0Thank You

ANSWER

Ac is used in electroplating process (true or false)

Posted by Ishrat Khiljhi 5 years, 7 months ago

CBSE > Class 12 > Physics

1 answers

Prabhkirat Brar 5 years, 7 months ago

False

0Thank You

ANSWER

What is depletion in p-n junction

Posted by Zafarul Hasan 5 years, 7 months ago

CBSE > Class 12 > Physics

1 answers

Shalini Singh 5 years, 7 months ago

The immobile charges are known as depletion region

1Thank You

ANSWER

I haven't solved a single sample paper or previous year question papers , it's not possible for me to score good ..it is true ...

Posted by Akanksha Dwivedi 5 years, 7 months ago

CBSE > Class 12 > Physics

2 answers

Payal Jarial 5 years, 7 months ago

If u have studied Ncert completely word by word no one can stop you from scoring good

0Thank You

Gp Semwal 5 years, 7 months ago

No it is not true learn only 1 unit and last chapter by heart u can score good marks

1Thank You

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Is DC motor and DC generator in syallabus

Posted by Shefu ??????? 5 years, 7 months ago

CBSE > Class 12 > Physics

1 answers

Tapan Pandey ?? 5 years, 7 months ago

0Thank You

ANSWER

What is bragg law

Posted by Shefu ??????? 5 years, 7 months ago

CBSE > Class 12 > Physics

1 answers

Arsh Pandher 5 years, 7 months ago

2dsinθ= nLamda

2Thank You

ANSWER

Which waves are used in radar system and why.Explain

Posted by Arsh Pandher 5 years, 7 months ago

CBSE > Class 12 > Physics

1 answers

Tapan Pandey ?? 5 years, 7 months ago

Microwaves are used for air craft navigation...

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ANSWER

Derive an experession for the magnetiv fipoleoment of a revolving electron and hence define bogr magneton

Posted by Konika Dubey 5 years, 7 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Two capacitors with capacitances C1& C2 are charged to potential V1& V2 respectively and then these are connected in parallel. Calculate Common potential across the combination

Posted by R.P. Jha 5 years, 7 months ago

CBSE > Class 12 > Physics

1 answers

Anjali Chaudhary 5 years, 7 months ago

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ANSWER

Double slit experiment

Posted by Ankit Tomar 5 years, 7 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

What is radio activity

Posted by Lovely Horam 5 years, 7 months ago

CBSE > Class 12 > Physics

2 answers

Xyz Abc 5 years, 7 months ago

Spontaneous emmission of alpha beta or gamma rays from a radioactive sample is called radioactivity After emmission of alpha or beta ray, a gamma ray is necassarily to be emmitted

0Thank You

Meera Bhombe 5 years, 7 months ago

It is the phenomenon os spontaneous disintegration of any unstable nucleus.

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By increasing doping do depletion inrease or decrease in p junction

Posted by Mohitpreet Sidhu 5 years, 7 months ago

CBSE > Class 12 > Physics