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The current in the forward bias is primarily due to major carriers but in reverse bias it is due to the minor carriers. As the fractional change in the reverse current due to the photoeffects is more easily measurable than in the forward bias current. So photodiodes are operated in the reverse bias.

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Define current

Posted by Manveer Shah 7 years ago

CBSE > Class 12 > Physics

1 answers

Ritik Verma 7 years ago

The rate of flow of charge

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Derivation of all imporatnt electrical devices.?

Posted by Deepa Mishra 7 years ago

CBSE > Class 12 > Physics

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A point object is held between two plane mirror held at 24°.what is number of images formed?

Posted by Vishal Kumar 7 years ago

CBSE > Class 12 > Physics

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How OR gate can be constructed using NOR gates?

Posted by Yuvraj Singh 7 years ago

CBSE > Class 12 > Physics

0 answers

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Why is electric potential in the field of a negative charge lower at near points and high at distant points?

Posted by Kajal Singhal 7 years ago

CBSE > Class 12 > Physics

0 answers

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What is Maxwell equation?

Posted by Ananya Ranjan 5 years, 8 months ago

CBSE > Class 12 > Physics

0 answers

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Kindly info me with the main topics to get struck upon so that I don't waste time in completing the phone syllabus in the remaining last 2 months of board exams. Plsss Plss Pls

Posted by Aditi Varshney 7 years ago

CBSE > Class 12 > Physics

3 answers

Satyam Dubey 7 years ago

Aditi have a bit revision of chapters so that u know the basics and then solve previous year papers and u will automatically come to know the most important chapters and topics and later focus only on them....

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Nishant Ray 7 years ago

In physics u read only summary of each chapter more modern physics in phy chemistey read it and math solved examples of all chapters

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Aditi Varshney 7 years ago

Instead of phone it is whole ?

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Cf g j

Posted by Manmeet Singh 5 years, 8 months ago

CBSE > Class 12 > Physics

1 answers

Mansi Sharma 7 years ago

Clearity needed !!! To understand the question .

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What is maxwell equation

Posted by Vikas Kumar 7 years ago

CBSE > Class 12 > Physics

1 answers

Yogita Ingle 7 years ago

Maxwell's equations describe how an electric field can generate a magnetic field and vice-versa. These equations describe the relationship and behaviour of electric and magnetic fields.
Maxwell gave a set of 4 equations which are known as Maxwell’s equations.
According to Maxwell equations:-
- A flow of electric current will generate magnetic field and if the current varies with time magnetic field will also give rise to an electric filed.
  - First equation (1) describes the surface integral of electric field.
  - Second equation (2) describes the surface integral of magnetic field.
  - Third equation (3) describes the line integral of electric field.
  - Fourth equation (4) describes line integral of magnetic field.

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What is meant by wavefront , fringe and wavelet

Posted by Lloyd Sebastian 7 years ago

CBSE > Class 12 > Physics

2 answers

Yogita Ingle 7 years ago

Wavefront

Wave front is defined as locus of all points having same phase at a given instant of time.
The shape of wavefront depends on the shape of the source of disturbance.
A wavefront is always normal to the light rays.

Wavelets - A wavelet is a wave-like oscillation with an amplitude that starts out at zero, increases, and then decreases back to zero. It can typically be visualized as a "brief oscillation" like one might see recorded by a seismograph or heart monitor.

Fringes: The alternate dark and red bands which are obtained on the screen are known as fringe pattern and the alternate dark and bright bands are known as fringes.

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Mansi Sharma 7 years ago

A surface containing points affected in the same way by a wave at a given time is called a wavefront .

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What is nand gate

Posted by Atul Anand 7 years ago

CBSE > Class 12 > Physics

1 answers

Shubham Sharma 7 years ago

Gate having both and & not logic gate

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I studied only last 10 years board papers how much will i score in board exam..

Posted by Mano Mano 7 years ago

CBSE > Class 12 > Physics

1 answers

Avi Panwar 7 years ago

40 max.

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What is electron mobility? What its unit?

Posted by Praveen Sharma 5 years, 8 months ago

CBSE > Class 12 > Physics

2 answers

O Singh 7 years ago

Unit-V^-1m^2 sec

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O Singh 7 years ago

Drift velocity per unit electric field is called mobility.

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Write the relation for the speed of electromagnetic waves in terms of the amplitudes of electric and magnetic fields.

Posted by Goinum Tagru 7 years ago

CBSE > Class 12 > Physics

1 answers

Aditi Bhat 7 years ago

C= E/B

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Advantage of useing thick metallic strips to join wires in a potentiometer

Posted by Aditya Singh 7 years ago

CBSE > Class 12 > Physics

1 answers

Shriya Gautam 7 years ago

Metallic strips have negligible resistance and need not to be counted in the length l1, of the null point of potentiometer. That’s why the thick metallic strips are used in potentiomete

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What is modulation and why it is necessary ?

Posted by Pratham Kaushik 7 years ago

CBSE > Class 12 > Physics

1 answers

Pratham Kaushik 7 years ago

Modulation is the process of varying one or more properties of a high frequency carrier signal, with respect to the message signal. Different types of modulation are: amplitude modulation (AM), frequency modulation (FM) and phase modulation (PM). The need for modulation can be summarized as follows: (1) The antenna needed for transmitting signals should have size at least λ/4, where, λ is the wavelength. The information signal, also known as baseband signal is of low frequency (and therefore the wavelength is high). If we need to transmit such a signal directly, the size of the antenna will be very large and impossible to build. Hence direct transmission is not practical. (2) The radiated power by an antenna is inversely proportional to the square of the wavelength. So, if we use high frequency signals, the power radiated will be increased. (3) If we transmit the baseband signals directly, the signals from different transmitters will get mixed up and the information will be lost. Because of these reasons, we use the technology of modulation, for transmitting message signals effectively for long distances.

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Fringes expresiion??

Posted by Rudra Bajaj 7 years ago

CBSE > Class 12 > Physics