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Two material bars A and B of equal area of cross-section, are connected in series to a DC supply. A is made of usual resistance wire and B of an n-type semiconductor. a. In which bar is drift speed of free electrons greater? b. If the same constant current continues to flow for a long time, how will the voltage drop across A and B be affected? Justify each answer.

Posted by Aakash Kumar 7 years ago

CBSE > Class 12 > Physics

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Bhors postulates and expressions for ke, pe, te

Posted by Prasanna Kumar 7 years ago

CBSE > Class 12 > Physics

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What is electrom

Posted by Satyajeet Singh 7 years ago

CBSE > Class 12 > Physics

2 answers

Aakash Kumar 7 years ago

It is an elementary particles which is of negative nature revolving around the nucleus

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Rajat Dhull 7 years ago

Pta ni yaar electron to pta hai agar pta chale to btana plzz??. Electron is the particle which revolve in a confined orbit on a path. It is a particle of an atom

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Lens maker fotmula derive

Posted by Rekha Gupta 7 years ago

CBSE > Class 12 > Physics

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Best model in physics

Posted by Arnav Singh 7 years ago

CBSE > Class 12 > Physics

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Limitation of ohms law

Posted by Atul Dwivedi 7 years ago

CBSE > Class 12 > Physics

1 answers

Yogita Ingle 7 years ago

Limitations of Ohm's Law:
Ohm's law is not a fundamental law of nature. There are a number of commonly used circuit elements which do not obey this law called Non – Ohmic conductors.
Non – Ohmic conductors have one or more of the following properties:
1. Potential difference (V) depends on current (I) non-linearly.
2. The relation between V and I is non-unique, that is, for the same current I, there is more than one value of voltage V.
3. The relationship between V and I depends on the sign of V f or the same absolute value of V.

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Why input characteristics for various values of Vce in common emitter configuration of non transistor gives almost identical values?

Posted by Soni Punia 7 years ago

CBSE > Class 12 > Physics

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Berivatin of mirror firmula of concave mirrir

Posted by Vivek Mehta 7 years ago

CBSE > Class 12 > Physics

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Physics project

Posted by Deekshant Sharma 7 years ago

CBSE > Class 12 > Physics

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Deduce Ohm's Law from drift velocity

Posted by Harry Bhatoa 7 years ago

CBSE > Class 12 > Physics

1 answers

Tarun Gulia 7 years ago

we know that we is directly proportional to I then acc to drift velocity I=neavd and Vd = eE\m so I= neAeEtorque\m then E v\l and I= ne2Avtorque \m V= I ×ml\ne2Atorque where ml\ne2 A torque is= Rso V=IR

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Active region , cut off region and saturation region in terms of forward biasing and reverse biasing..?

Posted by Komal Dhingra 7 years ago

CBSE > Class 12 > Physics

1 answers

Komal Dhingra 7 years ago

Like in active region, both junctions are frwd biased .., pls tell in other two??

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What is comman potential show that whenever two conductors share charges by bringing them into electrical contact there is a loss of energy

Posted by Sonia Thakur 7 years ago

CBSE > Class 12 > Physics

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What is meant by resonance condition of a cyclotron

Posted by Adithya Nair 7 years ago

CBSE > Class 12 > Physics

1 answers

Aditi Varshney 7 years ago

The frequency of the applied voltage is kept exactly the same as the frequency of revolution of the proton, then every time the proton reaches the gap between the two dees, the electric field is reversed And proton receive a push and finally it accquires very high energy. This is called Cycloton's Resonance .

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Do u have practical records

Posted by Bharatesh Patel 7 years ago

CBSE > Class 12 > Physics

3 answers

Srivinayak V 7 years ago

Yes

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Aditi Varshney 7 years ago

Yup

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Aryan Rai 7 years ago

yes

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Linear motion

Posted by Gurkirat Singh 7 years ago

CBSE > Class 12 > Physics

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A copper ball is placed at axial point of bar magnet.In which direction will the magnetic force acts ..justify?

Posted by Samriddhi Udaywal 7 years ago

CBSE > Class 12 > Physics

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Writevthe relation for binding e ergy in million electron volts of a nucleus of mass number A and atomic number in terms of mass of its constitutes

Posted by Aruna Kumar 7 years ago

CBSE > Class 12 > Physics

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A telescope resolves whereas a microscope magnifies. Justify the statement.

Posted by Tiksha Gupta 7 years ago

CBSE > Class 12 > Physics

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Define drift velocity.

Posted by Jyan Sheikh 7 years ago

CBSE > Class 12 > Physics

1 answers

Gaurav Tiwari 7 years ago

DRIFT VELOCITY is the average velocity gained by the free electrons of a conductor, with which the electrons get drifted under the influence of an electric field, applied externally across the conductor.

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Find the magnitude of electric field intensity between the 2 unlike charges but same magnitude placed at a distance 2 cm from one another

Posted by Ritika Chettri 7 years ago

CBSE > Class 12 > Physics