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First electric field line does not form closed loop second electric field lines never intersect each other third electric field line start from a positive charge and end at a negative charge fourth is a single charge is there then electric field will start from there and end to infinite

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The resistivity of a pure germanium at a particular temperature is 0.52 ohm. If the material is dopped with 10^20 atoms metre per cubic of a trivalent impurity material determine the new resistivity. Electron and hole mobility are 0.2 and 0.4 eith resp SI units

Posted by Somya Duhan 6 years, 11 months ago

CBSE > Class 12 > Physics

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Radio activity

Posted by Tayyabar Rahman Khan 6 years, 11 months ago

CBSE > Class 12 > Physics

1 answers

Shaikh Umar 6 years, 11 months ago

Emitted electron in their rest position

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???What is dynamic mass of a photon of frequency ❓❔❓❔???? (CBSE 2015 DELHI)

Posted by Yo Yo Honey Singh ? 6 years, 11 months ago

CBSE > Class 12 > Physics

3 answers

Haseel Amim 6 years, 11 months ago

Galvanometer is that instrument which is used to show the deflection in the current

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Shubh Jain 6 years, 11 months ago

What ans sir tell in this question

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Chaman Pal Singh 6 years, 11 months ago

Galvanometer

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?A straight conductor carrying current is placed horizontally in a uniform magnetic field pointing vertically downward.what will be the direction of the force experienced by the conductor if there is a current in it from left to right❓❔❓❔??????? (CBSE 2016 ALL INDIA)

Posted by Yo Yo Honey Singh ? 6 years, 11 months ago

CBSE > Class 12 > Physics

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Any idea about physics paper 2019 anyone

Posted by Priyanshu Chandola 6 years, 11 months ago

CBSE > Class 12 > Physics

1 answers

Yo Yo Honey Singh ? 6 years, 11 months ago

if you are asking about examination date ,I think it will be held on first or second week of March

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The radius of innermost electron orbit of a hydrogen atom is 5.1m.

Posted by Hamsini Bhaskara 6 years, 11 months ago

CBSE > Class 12 > Physics

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What is use of optical fibre

Posted by Sc Tujj 6 years, 11 months ago

CBSE > Class 12 > Physics

2 answers

Shaikh Umar 6 years, 11 months ago

In communication

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Rishabh Goyal 6 years, 11 months ago

Electrical cable, Transmit light, find wide usage in fiber-optic communications

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What is Spherical Aberration in telescopes ?

Posted by Tanu Singh 6 years, 11 months ago

CBSE > Class 12 > Physics

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What physics

Posted by Rampal Maurya 6 years, 11 months ago

CBSE > Class 12 > Physics

2 answers

Yo Yo Honey Singh ? 6 years, 11 months ago

Physics is the natural science that studies matter and its motion and behavior through space and time and that studies the related entities of energy and force. Physics is one of the most fundamental scientific disciplines, and its main goal is to understand how the universe behaves.

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Rajat Dhull 6 years, 11 months ago

Jisme 23 marks minimum hain paSs hone k liye aur jo bachon ko compart dila deti hai use kahate hai physics

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A 16 ohm resistance wire is bent to form a square. A source of emf 9 V is connected across one of its sides as shown. Calculate the current drawn from the source. Find the potential difference between the ends C and D. If now the wire is stretched uniformly to double the length and once again the same cell is connected in the same way, across one side of the square formed, what will now be the potential difference across one of its diagonals

Posted by Sneha Kalra 6 years, 11 months ago

CBSE > Class 12 > Physics

1 answers

Karthik Exports 5 years, 4 months ago

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What happen when 100g of ferromagneti substance change into parmanent magnet does it weight is little change or not

Posted by Vishal Tyagi 6 years, 11 months ago

CBSE > Class 12 > Physics

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What is Amplitude modulation???

Posted by Mansi Sharma 6 years, 11 months ago

CBSE > Class 12 > Physics

3 answers

Yo Yo Honey Singh ? 6 years, 11 months ago

If amplitude of carrier wave will change according to amplitude of message signal then it is called amplitude modulation

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Govind Tanwar 6 years, 11 months ago

Amplitude of carrier wave is varied in accordance with amplitude of modulating signal

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Yogita Ingle 6 years, 11 months ago

AM is the simplest way of modulating a signal.Production of amplitude modulated signals is easy. Also, the requirements are feasible. When an amplitude modulated signal is created, the amplitude of the created signal represents the original baseband signal to be transmitted. This amplitude forms an envelope over the underlying high-frequency carrier wave. Here, the overall envelope of the carrier is modulated to carry the audio signal. However, AM waves are interrupted by electrical and other disturbances which make them weak and noisy.

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Define the law of conservation of electric charge and its two examples

Posted by Harman Singh Dhillon 6 years, 11 months ago

CBSE > Class 12 > Physics

1 answers

Yogita Ingle 6 years, 11 months ago

Conservation of charge means one can’t produce a net charge.

For example :

1. Due to friction opposite charges appear on two bodies that are rubbing against each other. the net charge is still zero .

2.During radioactive deacy a proton decays into a positron(a particle with positive charge and mass equal to that of electron) and a neutron , again no net charge production.

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If the distance between two equal point charges is doubled and their individual charges are also doubled what would happen to the force between them

Posted by Harman Singh Dhillon 6 years, 11 months ago

CBSE > Class 12 > Physics