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

Fall of potential across any portion of wire is directly proportional to the length of that portion provided the wire of uniform cross section and a constant current is flowing through it.

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Surya Singh 5 years, 10 months ago

Potential drop across the ends of wire is directly proportional to the length of that section of wire

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Why is the electrostatic potential inside the spherical conducting shell remain constant throughout the volume?

Posted by Anjali Gahlawat 5 years, 10 months ago

CBSE > Class 12 > Physics

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Beta decay of tritium in symbolic form?

Posted by Saniya Khatoon 5 years, 10 months ago

CBSE > Class 12 > Physics

0 answers

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In electric Arc Furence copper or iron is melted due to variation of

Posted by Mar Dsk 5 years, 10 months ago

CBSE > Class 12 > Physics

1 answers

Ankita Khatri 5 years, 10 months ago

Electric field

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What is focal length? Ans half of radius of curvature is focal length Or Length of focus from pole is called focal length. Is both answers are correct? Please answer me

Posted by Mahi Khan 5 years, 10 months ago

CBSE > Class 12 > Physics

2 answers

Genius Girl 5 years, 10 months ago

2nd one is absolutely correct but 1st is correct in case of mirror only.

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Suraj Kumar 5 years, 10 months ago

Yes, both answers are correct

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force charge + 8 kulam - 3 + 5 kulan and minus 10 coulomb are kept inside a closed surface what will be the outgoing flux through the surface

Posted by Mar Dsk 5 years, 10 months ago

CBSE > Class 12 > Physics

1 answers

Vinay Singh 5 years, 10 months ago

Zero......

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why field lines formed continuous curve

Posted by Nagendra Kumar Yadav 5 years, 10 months ago

CBSE > Class 12 > Physics

1 answers

Ritwik Choudhary 5 years, 10 months ago

An electrostatic field line is a continuous curve because a charge experiences a continuous force when traced in an electrostatic field.

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Derive the len's maker formula for double convex lens

Posted by Mona Naz 5 years, 10 months ago

CBSE > Class 12 > Physics

3 answers

Surya Singh 5 years, 10 months ago

1/f= ((n2/n1)-1)(1/R1-1/R2)

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Surya Singh 5 years, 10 months ago

Lens maker formula is same for akl type of lena

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Adi Kumar 5 years, 10 months ago

I/f= (mew-1)[2/R]

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Project file with reading and activity file with reading

Posted by Jitender Kumar 5 years, 10 months ago

CBSE > Class 12 > Physics

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Derive an expression for intensity of electric field in end on position

Posted by Rajnish Chauhan 5 years, 10 months ago

CBSE > Class 12 > Physics

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project file on half wave rectifier : its theory

Posted by Damanpreet Kaur 5 years, 10 months ago

CBSE > Class 12 > Physics

1 answers

Man Har 5 years, 10 months ago

Write first of all about the rectifier and then write about the types name only and then write about the half wave rectifier

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What is the working principle of microwave oven

Posted by Ramisetti Rajasekhar 5 years, 10 months ago

CBSE > Class 12 > Physics

2 answers

Ritwik Choudhary 5 years, 10 months ago

The radio waves penetrate the food and excite water and fat molecules pretty much evenly throughout the food, unlike a conventional oven, where heat migrates toward the interior by conduction.

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Yogita Ingle 5 years, 10 months ago

Microwave oven is a simple yet amazing technological device which enables instant cooking.
Principle : Microwave radiation generated by a magnetron pass through the exposed food, create dielectric heating within the food, this is the basic principle on which a microwave oven works.

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The inherent property of all matter is

Posted by Brij Mohan 5 years, 10 months ago

CBSE > Class 12 > Physics

1 answers

Shubham Gaur 5 years, 10 months ago

Charge

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The electric potential of earth is taken to be zero because Earth is good

Posted by Shankar Prasad 5 years, 10 months ago

CBSE > Class 12 > Physics

2 answers

Ritwik Choudhary 5 years, 10 months ago

Conductor

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Rahul Yadav 5 years, 10 months ago

Co conductor

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A charge q is placed at the centre of the line joining two equal charges Q. The system of the three charges will be in equilibrium if qis equal to

Posted by Jasmine Chhillar 5 years, 10 months ago

CBSE > Class 12 > Physics

4 answers

Suraj Kumar 5 years, 10 months ago

Q/4

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Bhanvi Mehndiratta 5 years, 10 months ago

Q/3 is not in option khushi Agarwal

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Khushi Agrawal 5 years, 10 months ago

Q/3

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Bhanvi Mehndiratta 5 years, 10 months ago

Q/5

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What is frictional electricity?

Posted by Apoorva Rao 5 years, 10 months ago

CBSE > Class 12 > Physics

3 answers

Apoorva Rao 5 years, 10 months ago

Any other short answer please

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Apoorva Rao 5 years, 10 months ago

Thank you

1Thank You

Abdeali Najmi 5 years, 10 months ago

Frictional electricity is another name for triboelectricity - electricity generated by friction. It's most commonly associated with static electricity. Charge separation often occurs through rolling or sliding contact or collision, usually between different materials

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Barnolis theorum

Posted by Vicky Verma Verma 5 years, 10 months ago

CBSE > Class 12 > Physics

1 answers

Yogita Ingle 5 years, 10 months ago

Bernoulli’s Principle

For a streamline fluid flow, the sum of the pressure (P), the kinetic energy per unit volume (ρv²/2) and the potential energy per unit volume (ρgh) remain constant.
Mathematically:- P+ ρv²/2 + ρgh = constant
- where P= pressure ,
- E./ Volume=1/2mv²/V = 1/2v²(m/V) = 1/2ρv²
- E./Volume = mgh/V = (m/V)gh = ρgh

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Unit of surface charge density

Posted by Raja Kumar 5 years, 10 months ago

CBSE > Class 12 > Physics

2 answers

Sohan .G 5 years, 10 months ago

C/m^2 (or) Cm^-2

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Yogita Ingle 5 years, 10 months ago

Surface charge density is a measure of how much electric charge is accumulated over a surface. It is calculated as the charge per unit surface area. The SI unit of surface charge density is Cm^–2.

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A straight wire carrying current of 12A is bent into a semicircular arc of rafius 2cm. Consider the magnetic field at the centre of the arc.

Posted by Akanksha Singh 5 years, 10 months ago

CBSE > Class 12 > Physics

1 answers

Abdeali Najmi 5 years, 10 months ago

The magnetic field at the center of the arc is Explanation: Given that, Current = 12 A Radius of arc = 2 cm We know that, The magnetic field at the center of the arc is B=u°I/4r 4πx10^-7×12A/4×2×10^-2m B=1.88×10^-4T Hence, the magnetic field at the center of the arc is

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Resistance of an ideal ammeter is...... .. And that if ideal voltmeter

Posted by Parkash Kumar 5 years, 10 months ago

CBSE > Class 12 > Physics

2 answers

Adi Kumar 5 years, 10 months ago

Infinite for voltmeter

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Adi Kumar 5 years, 10 months ago

Zero for Ammeter

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If an electron has an initial velocity in a direction different from that of an electric field the path of the electron is

Posted by Rahul Goyat 5 years, 10 months ago

CBSE > Class 12 > Physics

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What is the locus of an electron projected perpendicular to a uniform electric field

Posted by Rahul Goyat 5 years, 10 months ago

CBSE > Class 12 > Physics

1 answers

Yogita Ingle 5 years, 10 months ago

When charged particle is placed in electric field , particle experience the electric force. direction of the force depends upon the sign of the charge.

If charge is positive then force is along the direction of electric field , charge is negative then force is opposite to the direction of electric field.

when electron is projected perpendicular to the uniform electric field , it experience the electric force in a direction opposite to the field. therefore it will follow the parabolic path.

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Is hystersis in syllabus??

Posted by Kartik Rastogi 5 years, 10 months ago

CBSE > Class 12 > Physics

1 answers

Devyani Malvi 5 years, 10 months ago

Yes

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Explain Biot savarts law ?

Posted by Abdeali Najmi 5 years, 10 months ago

CBSE > Class 12 > Physics

1 answers

Yogita Ingle 5 years, 10 months ago

We know that electric current or moving charges are source of magnetic field

A Small current carrying conductor of length dl (length element ) carrying current I is a elementary source of magnetic field .The force on another similar conductor can be expressed conveniently in terms of magnetic field dB due to the first
The dependence of magnetic field dB on current I ,on size and orientation of the length element dl and on distance r was first guessed by Biot and savart
The magnitude of the magnetic field dB at a distance r from a current element dl carrying current I is found to be proportional to I ,to the length dl and inversely proportional to the square of the distance |r|
The direction of the magnetic Field is perpendicular to the line element dl as well as radius r
Mathematically, Field dB is written as

Here (μ0/4π) is the proportionality constant such that μ0/4π=10-7 Tesla Meter/Ampere(Tm/A)

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All laws and devices

Posted by Vikas Sharma 5 years, 10 months ago

CBSE > Class 12 > Physics