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 8 years, 1 month ago

No need to do this ?

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ANSWER

Important chapters

Posted by Ruhaan Krma 8 years, 1 month ago

CBSE > Class 12 > Physics

2 answers

Avee Singh 8 years, 1 month ago

Optics

0Thank You

Cutie Monisha 8 years, 1 month ago

All chapters are important

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ANSWER

Is moving coil galvanometer is important.

Posted by Aman Narain 8 years, 1 month ago

CBSE > Class 12 > Physics

2 answers

Mahima Kumari 8 years, 1 month ago

Yes must practice it

1Thank You

Mmmmmmmmmmmmmmmmmmmm Wwwwwwwwwwwwwwwwwwww 8 years, 1 month ago

Hmm

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ANSWER

Sir there is no paper of cbse all India

Posted by Arpit Sharma 8 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Mmmmmmmmmmmmmmmmmmmm Wwwwwwwwwwwwwwwwwwww 8 years, 1 month ago

All India nahi hota delhi ya out of delhi hota hai

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ANSWER

derivations of astronomical telescope

Posted by Sudhanshu Arya 8 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Satyendra Tomar 8 years, 1 month ago

Book padh

1Thank You

ANSWER

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

Posted by Kshitij Kumar 8 years, 1 month ago

CBSE > Class 12 > Physics

2 answers

Mmmmmmmmmmmmmmmmmmmm Wwwwwwwwwwwwwwwwwwww 8 years, 1 month ago

For 100+ stop studying....

5Thank You

Saksham Phaugat 8 years, 1 month ago

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

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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 8 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Neeraj Sharma 8 years, 1 month ago

Solve it out through....√2rh...!!

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ANSWER

Elaborate equipotential surface

Posted by Ramneek Singh 8 years, 1 month ago

CBSE > Class 12 > Physics

2 answers

Satyendra Tomar 8 years, 1 month ago

The surface where the electric fied are same at all point

0Thank You

Om Mahawar 8 years, 1 month ago

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

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ANSWER

Write the underlying principle of a moving coil galvanometer

Posted by Nidhi Patle 8 years, 1 month ago

CBSE > Class 12 > Physics

3 answers

Mahima Kumari 8 years, 1 month ago

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

1Thank You

Sukhmeet Grewal 8 years, 1 month 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 8 years, 1 month 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 8 years, 1 month ago

CBSE > Class 12 > Physics

2 answers

Ankit Pandey 8 years, 1 month ago

It decreases

0Thank You

R Raja 8 years, 1 month ago

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

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ANSWER

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

Posted by Shashank Sikarwar 8 years, 1 month ago

CBSE > Class 12 > Physics

2 answers

Mahima Kumari 8 years, 1 month ago

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

0Thank You

R Raja 8 years, 1 month 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 8 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Tanuj Chauhan 8 years, 1 month ago

Yes

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ANSWER

Define ploarisation

Posted by Jass Wadhan 8 years, 1 month 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 8 years, 1 month 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 8 years, 1 month 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 8 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

R Raja 8 years, 1 month 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 8 years, 1 month ago

CBSE > Class 12 > Physics

2 answers

R Raja 8 years, 1 month ago

Phenol is colourless liquid.

2Thank You

Satyendra Tomar 8 years, 1 month 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 8 years, 1 month ago

CBSE > Class 12 > Physics

2 answers

Mmmmmmmmmmmmmmmmmmmm Wwwwwwwwwwwwwwwwwwww 8 years, 1 month ago

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

1Thank You

Jin Kazama 8 years, 1 month 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 8 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Jin Kazama 8 years, 1 month 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 8 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Satyendra Tomar 8 years, 1 month ago

Yup pandey

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ANSWER

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

Posted by Jin Kazama 8 years, 1 month ago

CBSE > Class 12 > Physics

2 answers

Pranjali Mahajan 8 years, 1 month ago

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

2Thank You

Rakshita Gothwal 8 years, 1 month 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 8 years, 1 month ago

CBSE > Class 12 > Physics

3 answers

Rakshita Gothwal 8 years, 1 month ago

There's electric field

0Thank You

Jin Kazama 8 years, 1 month ago

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

0Thank You

Neeharika Singh 8 years, 1 month 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 8 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Rachit Gupta 8 years, 1 month 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

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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 8 years, 1 month ago

CBSE > Class 12 > Physics