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

Loss of energy in form of heat during demagnetisation of a material is called histeresis loss. It can be fixed by replacing the core of transformers with soft iron core (having comparitively lesser hysteresis loop)

1Thank You

Jin Kazama 7 years, 10 months ago

No need to do this ?

0Thank You

ANSWER

Important chapters

Posted by Ruhaan Krma 7 years, 10 months ago

CBSE > Class 12 > Physics

2 answers

Avee Singh 7 years, 10 months ago

Optics

0Thank You

Cutie Monisha 7 years, 10 months ago

All chapters are important

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ANSWER

Is moving coil galvanometer is important.

Posted by Aman Narain 7 years, 10 months ago

CBSE > Class 12 > Physics

2 answers

Mahima Kumari 7 years, 10 months ago

Yes must practice it

1Thank You

Mmmmmmmmmmmmmmmmmmmm Wwwwwwwwwwwwwwwwwwww 7 years, 10 months ago

Hmm

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ANSWER

Sir there is no paper of cbse all India

Posted by Arpit Sharma 7 years, 10 months ago

CBSE > Class 12 > Physics

1 answers

Mmmmmmmmmmmmmmmmmmmm Wwwwwwwwwwwwwwwwwwww 7 years, 10 months ago

All India nahi hota delhi ya out of delhi hota hai

2Thank You

ANSWER

derivations of astronomical telescope

Posted by Sudhanshu Arya 7 years, 10 months ago

CBSE > Class 12 > Physics

1 answers

Satyendra Tomar 7 years, 10 months ago

Book padh

1Thank You

ANSWER

What are the important chapters to be studied in physics for scoring 90+?

Posted by Kshitij Kumar 7 years, 10 months ago

CBSE > Class 12 > Physics

2 answers

Mmmmmmmmmmmmmmmmmmmm Wwwwwwwwwwwwwwwwwwww 7 years, 10 months ago

For 100+ stop studying....

5Thank You

Saksham Phaugat 7 years, 10 months ago

For 90+, you have to study all the chapters but you can skip semiconductor and communication

2Thank You

ANSWER

In communication system the is range r if the height of antenna is doubled then what will be the increase in range

Posted by Singh Vishal 7 years, 10 months ago

CBSE > Class 12 > Physics

1 answers

Neeraj Sharma 7 years, 10 months ago

Solve it out through....√2rh...!!

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ANSWER

Elaborate equipotential surface

Posted by Ramneek Singh 7 years, 10 months ago

CBSE > Class 12 > Physics

2 answers

Satyendra Tomar 7 years, 10 months ago

The surface where the electric fied are same at all point

0Thank You

Om Mahawar 7 years, 10 months ago

The surfaces in which no work is to be done for moving a charge from one point on that surface to other point

2Thank You

ANSWER

Write the underlying principle of a moving coil galvanometer

Posted by Nidhi Patle 7 years, 10 months ago

CBSE > Class 12 > Physics

3 answers

Mahima Kumari 7 years, 10 months ago

It's principle : current carrying coil placed in a magnetic field, experience a torque

1Thank You

Sukhmeet Grewal 7 years, 10 months ago

The moving coil galvanometer based on the principal that when the current carrying coil is placed in a uniform magnetic field, it experiences a torque.

3Thank You

Ishu Chouhan 7 years, 10 months ago

Torque act on rectangular coil when it is kept in magnetic field

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ANSWER

How does angle of minimum deviation of glass prism vary if the incident Violet light is replaced by red light. Give reason

Posted by Tapas Kumar Ghosh 7 years, 10 months ago

CBSE > Class 12 > Physics

2 answers

Ankit Pandey 7 years, 10 months ago

It decreases

0Thank You

R Raja 7 years, 10 months ago

Red light will have less deviation compared to violet because it's wavelength is more and frequency is less.

2Thank You

ANSWER

Hello sir previous year paper question kya repeat ho ta ha kya

Posted by Shashank Sikarwar 7 years, 10 months ago

CBSE > Class 12 > Physics

2 answers

Mahima Kumari 7 years, 10 months ago

Sirf us type ka question aaega wohi question 10% chance h

0Thank You

R Raja 7 years, 10 months ago

Question type repeats not direct question.

2Thank You

ANSWER

Is antenna , receiver and internet under the syllabus of CBSE from COMMUNICATION SYSTEM??

Posted by Shantanu Upadhyay 7 years, 10 months ago

CBSE > Class 12 > Physics

1 answers

Tanuj Chauhan 7 years, 10 months ago

Yes

0Thank You

ANSWER

Define ploarisation

Posted by Jass Wadhan 7 years, 10 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

obtain the expression for the amount of workdone in bringing a point charge q from infinity to a point ,distant r in front of the charged plane sheet

Posted by Rahul Ranjan 7 years, 10 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Two point charge 4Q&Q are separated by 1 metre in air at what point on the line joining the charge is the electric field intansity is 0 ?

Posted by Sanyog Bharti 7 years, 10 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

If I fail in improvement exam, what will happen to the earlier passing marks?

Posted by Susanta Mandal 7 years, 10 months ago

CBSE > Class 12 > Physics

1 answers

R Raja 7 years, 10 months ago

If you give improvement exam than earlier marks is invalid even if you got better marks in earlier exam. You have to work with new marks only.

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ANSWER

Eeeee.... Rupali... Eeeeeee..... Rupali.... Pakad meri daali....... Eeeeeeee........ Rupali... Yo Yo Bantai Rapper........is colour of phinol pink or white????

Posted by Mmmmmmmmmmmmmmmmmmmm Wwwwwwwwwwwwwwwwwwww 7 years, 10 months ago

CBSE > Class 12 > Physics

2 answers

R Raja 7 years, 10 months ago

Phenol is colourless liquid.

2Thank You

Satyendra Tomar 7 years, 10 months ago

White

0Thank You

ANSWER

A boy is running towards a plane mirror with a speed of 2 m/s.with what speed, the image of the boy approaches him?

Posted by Pawan Kumar 7 years, 10 months ago

CBSE > Class 12 > Physics

2 answers

Mmmmmmmmmmmmmmmmmmmm Wwwwwwwwwwwwwwwwwwww 7 years, 10 months ago

Boy agar rukhega ni to shisha tood dega aur koi image ni banegi

1Thank You

Jin Kazama 7 years, 10 months ago

The boy saw it approaching towards himself with 4m/s speed ?

3Thank You

ANSWER

What do you mean by fabrication of a diode

Posted by Rakshita Gothwal 7 years, 10 months ago

CBSE > Class 12 > Physics

1 answers

Jin Kazama 7 years, 10 months ago

Mean preparation of a diode ?

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ANSWER

I will be eligible for uptu collges if i fill cbse improvement only in physics

Posted by Akash Pandey 7 years, 10 months ago

CBSE > Class 12 > Physics

1 answers

Satyendra Tomar 7 years, 10 months ago

Yup pandey

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ANSWER

With change of resistance due to temp. how resistivity change ???

Posted by Jin Kazama 7 years, 10 months ago

CBSE > Class 12 > Physics

2 answers

Pranjali Mahajan 7 years, 10 months ago

But resistivity will not change na until and unless we change the material

2Thank You

Rakshita Gothwal 7 years, 10 months ago

Change in resistivity= initial resistivity ( 1 + temperature coefficient * change in temperature)

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ANSWER

current is flowing in a cylindrical conductor .Is there any electric field within the conductor???

Posted by Jin Kazama 7 years, 10 months ago

CBSE > Class 12 > Physics

3 answers

Rakshita Gothwal 7 years, 10 months ago

There's electric field

0Thank You

Jin Kazama 7 years, 10 months ago

Pardeep say yes , page- 2/62 Q.3 ???

0Thank You

Neeharika Singh 7 years, 10 months ago

No, there is no electric field inside a conductor

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ANSWER

for converting a galvanometer into an ammeter a shunt resistance of small value is used in parallel,whereas in the case of a voltmeter a resistance of large value is used in series. explain

Posted by Prashant Kumar 7 years, 10 months ago

CBSE > Class 12 > Physics

1 answers

Rachit Gupta 7 years, 10 months ago

An ideal ammeter has zero resistance thats why shunt is used in parallel and a ideal voltmeter has infinite resistance and hence shunt resistance is used in series in a galvanometer

3Thank You

ANSWER

e capacitance of a air filled capacitor is 18pF.if ti is connected to a 100V supply,what is the charge on the each plate of the capacitor?What would happen to the charge capacitance&potential difference between the plates if a dielectric slab of dielectric constant K=6 is inserted between the plates (i) while the voltage supply remains connected (ii)after the supply was disconnected. Give the correct answer of this question plz.... Fastly...

Posted by Trishala Vijaywargiya 7 years, 10 months ago

CBSE > Class 12 > Physics