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

Ask questions which are clear, concise and easy to understand.

Ask Question

Explain coulambs law

Posted by Shiva Kushwaha 7 years, 1 month ago

2 answers

Gautam Rana 7 years, 1 month ago

the force acting b/w 2 stationary point is directly proportional to the product of the magnitude of the charges and inversely proportion to the square of the distance b/w them

0Thank You

Muktadhir Alehi Barbhuiya 7 years, 1 month ago

Coulomb's law states that the force of inte raction between two charges 'q1 and q2 'seperated by some distance 'r ' is directly proportional to the product of the charges and inversely proportional to the square of the distance between them. F directly proportional to q1×q2 F inversely proportional to 1/rsquare F=Kq1q2/rsquare Where , K=1/4π€° and F is the force of attraction or repulsion (interaction) q1and q2 are charges 'r' is the distance between the charges Value of K is 9×10to the power 9.only for SIunit .

2Thank You

ANSWER

Does critical angle depend on colour of light? Explain...

Posted by G K 7 years, 1 month ago

CBSE > Class 12 > Physics

0 answers

ANSWER

The refractive index of the water is 4/3 determine the angle of cone within which the entire outside view will be confined for a fish underwater

Posted by Suchith The Great 7 years, 1 month ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Which is more dangerous A.C. or D.C. and which will throw you and which will hold you

Posted by Gaura Jain 7 years, 1 month ago

CBSE > Class 12 > Physics

2 answers

Saloni S 7 years, 1 month ago

A.C. is more dangerous than D.C. If you touch the A.C.wire it hold you while if you touch the D.C. wire it will throw you

1Thank You

G K 7 years, 1 month ago

A.C is more dangerous.....becoz its peak value is 311V and that of D.C it is 220V...

3Thank You

ANSWER

Who gonna take full marks in Physics???????

Posted by Sakshi Singh 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Sakshi Singh 7 years ago

Do you afraid of Physics!!!!!!!!!!!!!!!!!!!!!!!!

0Thank You

ANSWER

Why do charges only on outer surface why??

Posted by Arpita Sharma 7 years, 1 month ago

CBSE > Class 12 > Physics

2 answers

Kanchan Lata 7 years, 1 month ago

Due to induction all the charges appears in thr outer surface.

1Thank You

Gaura Jain 7 years, 1 month ago

B'coz there is resistance inside the conductor

1Thank You

ANSWER

What percentage of ncert books question will arises in board exam of cbse.

Posted by Sandeep Kumar 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Abhay Rajput 7 years, 1 month ago

Its only approximately weightage of 70-75 % of ncert in maths but in physics the exam paper may consists 40-50 % from ncert. Question based on the topics outside from the ncert book may be asked in the physics board exam.

3Thank You

ANSWER

How to solve 1+0.004*80/1+0.004*20

Posted by Siva Dasan 7 years, 1 month ago

CBSE > Class 12 > Physics

0 answers

ANSWER

What is the net charge on the capacitor

Posted by Ankit Pathak 7 years, 1 month ago

CBSE > Class 12 > Physics

2 answers

Ritika Patil 7 years, 1 month ago

Zero

1Thank You

Raj Verma 5 years, 5 months ago

Lauda lassan

1Thank You

ANSWER

what is a potentiometer

Posted by Sahil Khan 7 years, 1 month ago

CBSE > Class 12 > Physics

3 answers

Harshi Gupta 7 years, 1 month ago

it is a device used to compare emf of two cells and calculate internal resistance

0Thank You

Vishakha Jain 7 years, 1 month ago

Device used to measure unknown emfs and potential difference

0Thank You

Mohit Sepat 7 years, 1 month ago

Device to measure potential difference more acurately than voltmeter.

0Thank You

ANSWER

If l take tussion of physics

Posted by Sonia Dhanda 7 years, 1 month ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Magnetic flux kya h

Posted by Raj Ankush 7 years, 1 month ago

CBSE > Class 12 > Physics

2 answers

Navneet Kumar Niraj 7 years, 1 month ago

Number of magnetic field lines passes per unit area is know as magnetic field. Iske pehle wala answer electric flux ka hai

2Thank You

Krishna Mahto 7 years, 1 month ago

The electirc field paases through a certain space called electir flux

1Thank You

ANSWER

Define lenz law

Posted by Vishwajeet Gupta 7 years, 1 month ago

CBSE > Class 12 > Physics

2 answers

Ritika Patil 7 years, 1 month ago

The direction of induced current is such that it opposes the cause responsible for its production.

1Thank You

Rashi Rawat 7 years, 1 month ago

Lenz law gives the direction of induced current and emf and also oppose the cause respobaiblefor its production

2Thank You

ANSWER

How time period of cyclotron independent of speedof charge nd radius of circlar path

Posted by Annu Verma 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Ritika Patil 7 years, 1 month ago

T=2πm/bq so it is independent of speed and radius

1Thank You

ANSWER

Please tell me the realisation of AND gate??? (you will be thankful) ?????

Posted by Sakshi Singh 7 years, 1 month ago

CBSE > Class 12 > Physics

2 answers

Sakshi Singh 7 years, 1 month ago

I didn't ask this. I asked realisation of and gate.

1Thank You

Akash Yadav 7 years, 1 month ago

And Gate is product gate In which we product A & B

1Thank You

ANSWER

a bar magnet is 10 cm long. Its magnetic is 0.4 Amphere/metre square. It is placed is magnetic meridian with its noth pole towards north. If the neutral point is obtained at a distance of 10 cm from the centre of the magnet, find the horizontal component of earth's magnetic field

Posted by Ishika Rathore 7 years, 1 month ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Two identical loops one of copper and the other of aluminium are rotated with same angularspeed in the same magnetic Field compare The induced emf and the cuRrent produced in the two coils

Posted by Aakash Yadav 7 years, 1 month ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Why electric field do not formed closed loop

Posted by Dinesh Limboo 7 years, 1 month ago

CBSE > Class 12 > Physics

2 answers

Sakshi Singh 7 years, 1 month ago

Because if they do there will be two tangents at a point which is impossible.

1Thank You

Ashutosh Kumar 7 years, 1 month ago

As electric field start from positive or end at infinity thats why they do not form close loop

0Thank You

ANSWER

What can i read in physics plss give me some tips ? how i study? i do not understand anything in physics plss help me my harf yearly exam is near i read in class12

Posted by Sahil Rajput 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Wani Rao 7 years, 1 month ago

Focus on the derivation part.practice it more and more Then learn all the imp. results (formula) which help in solving numericals.

1Thank You

ANSWER

In certain aarrangment a protone does not get deflected while passing throught a magnetic fild region state the candition under which it possible

Posted by Rupa Singh 7 years, 1 month ago

CBSE > Class 12 > Physics

2 answers

Saurabh Chaturvedi 7 years, 1 month ago

Fdstdsdtdsas daaCgdxfxzxcx

3Thank You

Rahul Poddar 7 years, 1 month ago

When proton move parallel or anti parallel with magnetic field means either 0° or 180°, then the magnetic force on proton =0

4Thank You

ANSWER

Show that the motion of negatively charged particle is approximately simple harmonic motion calculate the time period of oscillations?

Posted by Navdeep Singh 7 years, 1 month ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Sir kya physics hindi language me available hai

Posted by Sudhir Gupta 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Ashutosh Kumar 7 years, 1 month ago

0Thank You

ANSWER

Amprer circular low

Posted by Rupa Singh 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Anurag Singh 7 years, 1 month ago

Line integral of E.ds of a circit is Uo times current flowing through circuit......,

7Thank You

ANSWER

Why light travel in straight line

Posted by Navneet Kumar Niraj 7 years, 1 month ago

CBSE > Class 12 > Physics

2 answers

Mohit Sepat 7 years, 1 month ago

Yes correct

1Thank You

Kush Patel 7 years, 1 month ago

Actually light does not travel in straight line. It travels as Wave. In one time period it goes up and down. But this distance is very low and its called wave length. Thats why we assume light as travelling in straight line.

1Thank You

ANSWER

What is the frequency of direct current?

Posted by Prashant Singh 7 years, 1 month ago

CBSE > Class 12 > Physics

2 answers

Mohit Sepat 7 years, 1 month ago

How u can say that it is 0

1Thank You

Manisha Sorout 7 years, 1 month ago

0Thank You

ANSWER

What is laws of malus

Posted by Anuj Kumar 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Muskan Khan 7 years, 1 month ago

It states that if completely plane polarised light is passed through an analyser, the intensity of light transmitted is directly proportional to cos square theta

0Thank You

ANSWER

State gauss theorm in electostatic,apply this theorm to derive an expression for electric field intensity at a point near an infinite long stright charge wire.

Posted by Anushuiya Pahan 7 years, 1 month ago

CBSE > Class 12 > Physics