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

Try maximum to complete the answer with calculations. If not possible to calculate few big values dont waste ur time u will only loose half marks for last answer. But when u calculated the answer and wrote it and if it wrong i am sure u will loose more than half mark. Practice calculations. Do slowly... learn tables still 19,square still 20.. square roots of few important values....

2Thank You

∂Αяѕнαиαα ყα∂Αѵ ??? 6 years, 5 months ago

If u are a bio student like me.... then there is no option. the only way to improve calculation is to practice numerical more nd more.... ✌️

4Thank You

ANSWER

Why no work is done in moving a charge over an equipotential surface ??

Posted by Priya Dharshini ? 6 years, 5 months ago

CBSE > Class 12 > Physics

4 answers

Aman Kumar 6 years, 5 months ago

Yes u r right

3Thank You

Aman Kumar 6 years, 5 months ago

If a positive charge q is moved from point A to B then, Vb-Va =Wab/q.......where, W(ab) is the work done in moving the charge q from A to B.....since they are on the same potential surface...therefore....no work is done...Vb-Va =0.....=>W(ab)=0

1Thank You

Kumar Vishal Behera 6 years, 5 months ago

Yes you are right.

1Thank You

Priya Dharshini ? 6 years, 5 months ago

Because potential difference between the two points are zero ?answer fast

1Thank You

ANSWER

If you peer through very small cracks between your fingers at a tubelight far distance away. You will see- (1) uniform illumination (2) bright and dark fringes due to interference (3) bright and dark Fresnell's diffraction fringes (4) bright and dark Fraunhoffer's diffraction fringes

Posted by Rishika Choudhary 6 years, 5 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

The law, govering force between electric charge know as?

Posted by Gaurav Singh 6 years, 5 months ago

CBSE > Class 12 > Physics

3 answers

???. Pragati 6 years, 5 months ago

Coulomb's law

2Thank You

Arnav Bindal 6 years, 5 months ago

Only for point charges

0Thank You

Arnav Bindal 6 years, 5 months ago

Coulombs law

1Thank You

ANSWER

difference between series capacitance and parallel capacitance?

Posted by Deepak Rajput 6 years, 5 months ago

CBSE > Class 12 > Physics

2 answers

Tushar Kumar 6 years, 5 months ago

It is just opposite of the case resistance

0Thank You

Aman Kumar 6 years, 5 months ago

In series capacitance...:- 1/C.eq=> 1/C1+1/C2+1/C3....and for parallel capacitance:-1/C.eq =>C1+C2+C3...

1Thank You

ANSWER

What is Columbus low?

Posted by Vishal Kumar 6 years, 5 months ago

CBSE > Class 12 > Physics

2 answers

???. Pragati 6 years, 5 months ago

Coulomb's law describes the force between two charged particles.

0Thank You

Aman Kumar 6 years, 5 months ago

According to this law," The force of attraction or replusion is directly proportional to the product of charges and inversely proportional to square of the distance between them.."

2Thank You

ANSWER

Calculate the number of electric lines of forces from a charge 1.7708×10 raise to power -6 coloumb in air medium

Posted by Yash Sharma 6 years, 5 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

The 2 charges of +q are tied with a string, what is the min velocity needed to comp. 1 round in VERTICAL CIRCULAR MOTION???

Posted by Aditya Goswami 6 years, 5 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Thermodynamics

Posted by Kaushal Bhatt 6 years, 5 months ago

CBSE > Class 12 > Physics

1 answers

Santosh Sharma 6 years, 5 months ago

It is

0Thank You

ANSWER

What do you mean by flux

Posted by Vinay Ranjan 6 years, 5 months ago

CBSE > Class 12 > Physics

3 answers

Yogita Ingle 6 years, 5 months ago

Electric flux is the measure of flow of the electric field through a given area. Electric flux is proportional to the number of electric field lines going through a normally perpendicular surface.
Electric flux, Δφ = EΔS = E ΔScosθ, θ is angle between E and ΔS.
Unit of electric flux is NC^-1m².

2Thank You

Manish Kumar 6 years, 5 months ago

Number of electric field lines passing through cross section area (perpendicular to surface)

3Thank You

Aman Singh 6 years, 5 months ago

Number of electric field line passing through certain area normal to it

1Thank You

ANSWER

A cup of tea cools from 86°C to 84°C in40s when room temperature is 30°C. How long will the tea cup take to cool from 86°C to 84°C when the room temperature is 10°C?

Posted by Khushi Jain 6 years, 5 months ago

CBSE > Class 12 > Physics

1 answers

Purbendu Halder 6 years, 5 months ago

29.34 secs.

0Thank You

ANSWER

Best reference book for physics class 12 cbse

Posted by Krishna Dixit 6 years, 5 months ago

CBSE > Class 12 > Physics

3 answers

Priya Dharshini ? 6 years, 5 months ago

SL arora for boards and jee u can refer DC pandey

1Thank You

Kumar Vishal Behera 6 years, 5 months ago

Yes sl arora.

1Thank You

Prakriti Rao 6 years, 5 months ago

SL Arora according to me

2Thank You

ANSWER

which is the best reference book for up board 12th class pcm

Posted by Akshat Srivastava 6 years, 5 months ago

CBSE > Class 12 > Physics

2 answers

Akshat Srivastava 6 years, 1 month ago

What fo up board

0Thank You

Tannu Sehwag 6 years, 5 months ago

If u wanted to score good marks in cbse.. Then choose arihant... Its really.. Good book If u are preparing for any other competitive exam.. Then pradeep

0Thank You

ANSWER

Two equal like charges in air repel each other with a force f . By what % should each charge be reduced so that the force between them in a medium of dielectric constant 2 reduces by 28%

Posted by Shivangi Gupta 6 years, 5 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

determine the total charge on 75.0 kg of electrons?

Posted by Shubham Kumar Yadav 6 years, 5 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

U1=1, u2=1.5, u=-100cm &R=20cm at what position image found v?

Posted by Night Of Game 6 years, 5 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

What is the dimensiional formula of Impulse, capacitance, polarisation and potential

Posted by Anushka Sen?? 6 years, 5 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

What happen when some charge is placed on a soap bubble?

Posted by Aditya Mishra 6 years, 5 months ago

CBSE > Class 12 > Physics

1 answers

Aman Kumar 6 years, 5 months ago

The size of the soap bubble get increases....becoz the charge on the surface of bubble opposite sides ,repel each other...which increases its size

2Thank You

ANSWER

How to remember the formulas of current electricity

Posted by Vinoth Kumar 6 years, 5 months ago

CBSE > Class 12 > Physics

1 answers

Priya Dharshini ? 6 years, 5 months ago

Write it five times.... practice numericals from it u will automatically remember the formulae

2Thank You

ANSWER

What does charging by induction mean?

Posted by Ashlin Aldrin 6 years, 5 months ago

CBSE > Class 12 > Physics

1 answers

Nishu Sahu 6 years, 5 months ago

Charging by induction is a phenomenon of charging an uncharged body by keeping a charged body near it without any direct contact with each other.

0Thank You

ANSWER

Why potential in a hollow charged as same as at the surface

Posted by Subhash Chand Bidhuri 6 years, 5 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

In hydrogen atom an electron revolves round a proton in a circular orbit of radius 0.53*10^-10 m calculate linear velocity

Posted by Taniya Malik 6 years, 5 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Why must electrostatic field at the surfaces of a charged conductor be pependicular to every point on it

Posted by Hardik Bisht 6 years, 5 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

A charge +2microC is placed at a pointA (2,1,0) another charge of -3micro C is placed at a point B (4,2,1)calculate net force on a charge +5microC placed at point C (-1,3,2)

Posted by Chehak Goyal 6 years, 5 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Define coloumbs laws

Posted by Maurya Riteshsonu 6 years, 5 months ago

CBSE > Class 12 > Physics

3 answers

Yogita Ingle 6 years, 5 months ago

Coulomb’s law states that Force exerted between two point charges:

Is inversely proportional to square of the distance between these charges and
Is directly proportional to product of magnitude of the two charges
Acts along the line joining the two point charges.

{tex}\begin{array}{l}F\;\;=k\frac{\left|q_1q_2\right|}{r^2}\;where\;k=\;\frac1{4{\mathrm{πE}}_0}\\So\;F=\;\frac1{4{\mathrm{πE}}_0}\frac{\left|q_1q_2\right|}{r^2}\end{array}{/tex}

Here ε₀ = 8.854 x 10^-12 C² N^-1 m^-2is called permittivityof free space.

2Thank You

R Chaudhary 6 years, 5 months ago

When the both charges is in rest

2Thank You

Jashan Sethi 6 years, 5 months ago

According to coulomb's law the force applied on a charge by another charge is directly proportional to the product of charges and inversely proportional to the square of distance between the two charges

3Thank You

ANSWER

Gauss law ??

Posted by Abhishek Kala 6 years, 5 months ago

CBSE > Class 12 > Physics

2 answers

Yogita Ingle 6 years, 5 months ago

According to Gauss’s law, the total of the electric flux out of a closed surface is equal to the charge enclosed divided by the permittivity. The total electric flux through a closed surface is zero if no charge is enclosed by the surface.

Gauss’s law is true for any closed surface, no matter what its shape or size.
The term q on the right side of Gauss’s lawincludes the sum of all charges enclosed by the surface. The charges may be located anywhere inside the surface.

1Thank You

Adarsh Deep Gupta 6 years, 5 months ago

According to gauss law"Total electric Flux Through Closed Surface Is Equal to onebypermitivityinair(epsilion not) Total Charge Enclosed By Close Surface

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