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

it states that the line integral of the magnetic field B around any closed circuit is equal to μο times the total current I threading or passing through the closed circuit

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Shivam Chaurasia 6 years, 6 months ago

Line integral of magnetic field and length is meu not times current.

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can two charges attract and how?

Posted by Dashing Abhi 6 years, 6 months ago

CBSE > Class 12 > Physics

2 answers

Pradhum Parashar 6 years, 6 months ago

Yes of they are opposite

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Shivam Chaurasia 6 years, 6 months ago

Because of change in electron two charges attracts for their stability and lower potential energy.

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two magnetic poles one of which is 10 times as strong as the other ,exert on each other a force equal to 9.604 mN , when places 10cm apart in air . find the strength of two poles

Posted by Mohd Maaz 6 years, 6 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

What is exam fee for class 12

Posted by Ankit Mishra 6 years, 6 months ago

CBSE > Class 12 > Physics

4 answers

Kalpana Jha 6 years, 6 months ago

Registration fee- 1500 Per practical subject- 150 Migration fee (compulsory)- 350 Physical education - 450

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Priya Dharshini ? 6 years, 6 months ago

Around 1000 u need to pay.. once ask ur teacher while registration..

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Aadi Ahluwalia 6 years, 6 months ago

5000

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Řøhăň Řąjpůť ✌️✊ 6 years, 6 months ago

They will inform u during registration.

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A proton and a dutiron and alpha particle whose kinetic energy are same enter perpendicular to a uniform magnetic field compare the radii their circular path

Posted by Kushal Koyal 6 years, 6 months ago

CBSE > Class 12 > Physics

0 answers

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A step up transformer is operated on a 2.5kilowatt it supply a lead with 20 ampere the ratio of the primary Winding to the secondary winding is 10:1, if the transformer is 90%efficient calculate the out put power , output voltage and current in the secondary

Posted by Prakhar Gupta 6 years, 6 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

In a metre bridge Why on interchanging the cell galvanometer show no deflection

Posted by Amol Gùpta 6 years, 6 months ago

CBSE > Class 12 > Physics

1 answers

Madhav Garg 6 years, 6 months ago

Bcoz balance point remains unchanged

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ANSWER

If the power of a lens is +5 diopter , what is its focal length?

Posted by Japneet Brar 6 years, 6 months ago

CBSE > Class 12 > Physics

1 answers

Prakash Chand 6 years, 6 months ago

Power is inversely proportional to focal length P=1/F

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What is current density

Posted by Ɽøⱨł₮ ₲Ʉ₱₮₳ 6 years, 6 months ago

CBSE > Class 12 > Physics

2 answers

Aastha Saxena 6 years, 6 months ago

When the current pass through the unit surface area is called current density.It is denoted by J. J = delta I/delta s

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Amol Gùpta 6 years, 6 months ago

the amount of electric current flowing per unit cross-sectional area of a material.

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If a

Posted by Supriya Jaiswal 6 years, 6 months ago

CBSE > Class 12 > Physics

1 answers

Ɽøⱨł₮ ₲Ʉ₱₮₳ 6 years, 6 months ago

Write complete question

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What is the max velocity of charge particle in the uniform magnetic field?

Posted by Ayush Anand 6 years, 6 months ago

CBSE > Class 12 > Physics

1 answers

Premesh Tyagi 6 years, 6 months ago

Fmax=qvb

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A parallel plate capacitor has plate area of 25•0 cm^2 and a separation of 2•0mm between its platws

Posted by Raj Tomar 6 years, 6 months ago

CBSE > Class 12 > Physics

1 answers

Gaurav Seth 6 years, 6 months ago

Question: A parallel-plate capacitor has plate area 25.0cm²and a separation of 2.00mm between the plates. The capacitor is connected to a battery of 12.0V. (a) Find the charge on the capacitor, (b) The plate separation is decreased to 100mm. Find the extra charge given by the battery to the positive plate.

Plate area A = 25cm² = 2.5 × 10^–3m
Separation d = 2mm = 2 × 10^–3m
Potential v = 12v

(a) We know C = ε₀A/d = (8.85 x 10^-12 x 2.5 x 10^-3)/(2 x 10^-3) = 11.06 x 10^-12F

C = q/v => 11.06 x 10^-12 = q/12

=> q₁ = 1.32 x 10^-10c

(b) Then d = decreased to 1mm

∴ The extra charge given to plate = (2.65 – 1.32) × 10^-10 = 1.33 × 10^–10C.

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ANSWER

Proof which are important for board exam

Posted by Sachin Kumar 6 years, 6 months ago

CBSE > Class 12 > Physics

1 answers

Sia ? 6 years, 6 months ago

You can check last year paper: https://mycbseguide.com/cbse-question-papers.html

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ANSWER

What is conductor

Posted by Lawkesh Kumar 6 years, 6 months ago

CBSE > Class 12 > Physics

4 answers

Premesh Tyagi 6 years, 6 months ago

Flow of electrons at room temperature is called conductor

0Thank You

Rock Star Unique Boy 6 years, 6 months ago

These are the substances which allow large scale physical movement of electric charges through them when an external electric field is applied. Ex- silver, copper, aluminum, water, wetted body,etc.

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Sachin Kumar 6 years, 6 months ago

Material which allows current

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Kajal Stark 6 years, 6 months ago

It has ability to conduct electricity and flow charge

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Why two similar charges repail each other

Posted by Akash Singh 6 years, 6 months ago

CBSE > Class 12 > Physics

1 answers

Anmol Singh 6 years, 6 months ago

It's still under research why do two similar cahrges repel .....

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Why there is no e field inside the dees in cyclotron?

Posted by Deshna Parikh 6 years, 6 months ago

CBSE > Class 12 > Physics

2 answers

Premesh Tyagi 6 years, 6 months ago

In hollow metallic conductor present magnetic field note in electric field so no electric field inside the des in cyclotron

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Anmol Singh 6 years, 6 months ago

There is no electric field inside dees because they are hollow , vacuum evacuated metal dees . Since electric field inside hollow metal conductor is zero so the dees don't have electric field inside them

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pattern of paper

Posted by Reigns Media 6 years, 6 months ago

CBSE > Class 12 > Physics

1 answers

Sia ? 6 years, 6 months ago

Check here: https://mycbseguide.com/cbse-syllabus.html

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Daimention formula of specific resistance

Posted by Nikhil Bhalse 6 years, 6 months ago

CBSE > Class 12 > Physics

1 answers

Sia ? 6 years, 6 months ago

The specific resistance of a substance is its resistance when it is one-meter-long and its area of cross Section is one m2.

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Is it true that board practicals will be conducted outside?

Posted by Zehra Mustafa 6 years, 6 months ago

CBSE > Class 12 > Physics

3 answers

Priya Dharshini ? 6 years, 6 months ago

NOt yet confirmed in official website of cbse... we need to wait..

1Thank You

Priya Pandey 6 years, 6 months ago

Yes it is true.

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Parthapratim Datta 6 years, 6 months ago

Not yet confirm but may be it will be conduct outside

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In which chapter have gauss theorem

Posted by Rohan Gautam 6 years, 6 months ago

CBSE > Class 12 > Physics

3 answers

Rock Star Unique Boy 6 years, 6 months ago

Electric charges and field

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Zehra Mustafa 6 years, 6 months ago

Electrostatics

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Riti Roy 6 years, 6 months ago

Electrostats

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Why electric current is scalar quantity though it has direction

Posted by Aman Kumar 6 years, 6 months ago

CBSE > Class 12 > Physics

2 answers

Manu Paliwal 6 years, 6 months ago

Due to scalar adittion

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Riti Roy 6 years, 6 months ago

Is doesn't follow vector law of addition

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Why electric current is a vector quantity

Posted by Aman Kumar 6 years, 6 months ago

CBSE > Class 12 > Physics

3 answers

Shikha Das 6 years, 6 months ago

Because it have magnitude and dire tion both so it is vector quantity.

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Uday Gupta 6 years, 6 months ago

But electric current is a scalar quantity

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Ɽøⱨł₮ ₲Ʉ₱₮₳ 6 years, 6 months ago

It have magnitude and direction both so electric current is vector quantity

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Constant is used for making standard resistance why

Posted by Devesh Mishra 6 years, 6 months ago

CBSE > Class 12 > Physics

1 answers

Shivam Chaurasia 6 years, 6 months ago

It provide larger resistivity as wellas resistance to current since it is alloys .

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1.3

Posted by Sunny Kumar 6 years, 6 months ago

CBSE > Class 12 > Physics

0 answers

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Current voltage , ohm law , resistance and resisitivity ki definition bhejo yrr koi jaldi

Posted by Aadi Ahluwalia 6 years, 6 months ago

CBSE > Class 12 > Physics

1 answers

Aman Pratap 6 years, 6 months ago

Ohm's law~ At constant temperature current is directly proportional to potential difference. Resistance ~ it is the obstruction in the flow of current .

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A04490FD3B

Posted by Sports Tech 6 years, 6 months ago

CBSE > Class 12 > Physics