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

A parallel plate capacitor consists of two large plane parallel conducting metal plates separated by a small distance. The second plate acts as a neighbouring conductor due to which the potential of first plate is reduced, keeping its size same ;due to which the capacitance increases.

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Principal of moving coil galvanometer

Posted by Ankush Ranka 8 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Deepak Singh Baghel 8 years, 1 month ago

Whenever a moving coil placed in a magnetic field it experiences a torque

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What is Moving cool galvanometer

Posted by Ankush Ranka 8 years, 1 month ago

CBSE > Class 12 > Physics

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Two identical wires Aand B each of length 'o'clock carry the same current I. Wire A is bent into a circle of radius R and wire B is bent into a square of side 'a' .if Ba and Bb are the values of magnetic field at the centre of the circle and square respectively ,then the ratio Ba:Bb is:

Posted by Aman Boora 8 years, 1 month ago

CBSE > Class 12 > Physics

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Sir when u will issue exam time table class 12

Posted by Sanjana Gupta 8 years, 1 month ago

CBSE > Class 12 > Physics

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How we prepare for the physics exam in last 4month. Pls reply

Posted by Divya Kumari 8 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Vivek Saini 8 years, 1 month ago

Read numerical chapter from fundamental and theory based chapter from ncert

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Explanation of Huygens's principle

Posted by Mohammad Zahid 8 years, 1 month ago

CBSE > Class 12 > Physics

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What is the principal of wheat stone bridge?

Posted by Paras Adhwaryu 8 years, 1 month ago

CBSE > Class 12 > Physics

2 answers

Aditi Singh 8 years, 1 month ago

It is based on the principle that when 4 resistors P,Q,R,S are connected in a circuit to form a bridge by connecting a galvanometer using key K2 and a cell using key K1 then by closing the key K1 first and K2 later. If galvanometer does not show any deflection then the bridge is balanced

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Ankita Kumari 8 years, 1 month ago

It is based on the principal of Kirchoff's law

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Derive the formula for magnetic field at the centre of a circular loop

Posted by Nikhil Mishra 8 years, 1 month ago

CBSE > Class 12 > Physics

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how Ac current is different from dc current

Posted by Sarfraj Siddiqui 8 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Himanshi Bhola 8 years, 1 month ago

DC has more emf than ac. DC produces more heat than ac. DC shock is fatal. DC installation of transformer are more expensive than ac.

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How to find the bulk modulus

Posted by Pradeep Rajendran 8 years, 1 month ago

CBSE > Class 12 > Physics

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Electronic devices

Posted by Suraj Sharma Sharma 8 years, 1 month ago

CBSE > Class 12 > Physics

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Accelerate

Posted by Dipak Kumar 8 years, 1 month ago

CBSE > Class 12 > Physics

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What will happen to the motion of charged particle if frequency of alternating voltage is doubled

Posted by Anil Kumar 8 years, 1 month ago

CBSE > Class 12 > Physics

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What is Wheatstone bridge

Posted by Aditya Srivastava 8 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Divyansh Sharma 8 years, 1 month ago

If the four resistance are connected in the form of square, the galvanometer is connected across the one diagonal while the potential difference is connected to another diagonal then this arrangement is known as Wheatstone bridge

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Why sky appears blue

Posted by Tanveer Patel 8 years, 1 month ago

CBSE > Class 12 > Physics

3 answers

Vivek Saini 8 years, 1 month ago

Because blue light has less wavelength due to which it scatter more

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Divyansh Sharma 8 years, 1 month ago

Due to Tyndall effect

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Tanveer Patel 8 years, 1 month ago

Due to scattering of light

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Si unit of magnetic field

Posted by Rajat Dwivedi 8 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Manisha Yadav 8 years, 1 month ago

Tesla

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Officials Date sheet of board exams please assist.....

Posted by Divyank Godiyal 8 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Prashant Shukla 8 years, 1 month ago

It is still not released by CBSE.

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What type of lens is an air bubble inside water

Posted by Manish Yadav 8 years, 1 month ago

CBSE > Class 12 > Physics

2 answers

Vivek Saini 8 years, 1 month ago

Convex lens I m sure

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Ankur Gangwar 8 years, 1 month ago

Diverging lens

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Sunset is red

Posted by Simmy Verma 8 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Prashant Shukla 8 years, 1 month ago

Due to the scattering of light most of colours scattered away due to the large distance during that time only large wavelength red colour comes in yr eyes so sky appears red at sunset

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what is sky waves

Posted by Darkpok 2444T 8 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Prashant Shukla 8 years, 1 month ago

Waves of frequencies between 2Mz to 30Mz which are used in sky wave propagation are called sky waves

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What is the condition for maximum current to be drawn from a cell?

Posted by Deepanshi Soni 8 years, 1 month ago

CBSE > Class 12 > Physics

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Send the date sheet please

Posted by Sumit Gupta 8 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Mansi Kaushal 8 years, 1 month ago

Not yet released

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What is sky wave communication ?

Posted by Upendra Ponia 8 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Prashant Shukla 8 years, 1 month ago

It has particular frequency between 2Mz to 30Mz

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What do you mean by dipole moment

Posted by Shivani Choudhary 8 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Aditi Singh 8 years, 1 month ago

It is the product of magnitude of either charge and the distance between them

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What is n type semiconductor

Posted by Yogesh Balija 8 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Shagun Sharma 8 years, 1 month ago

n type semi conductor are this in which electrons are majority carrier and holes are minority carrier

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How a transistor works in switch mode?

Posted by Anisur Rahaman 8 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Kritika Trehan 8 years, 1 month ago

<a href="https://www.elprocus.com/transistors-basics-types-baising-modes/">A transistor is a three-terminal semiconductor device</a> which can be used for switching applications, amplification of weak signals and in quantities of thousands and millions of transistors are interconnected and embedded into a tiny integrated circuit/chip, which makes computer memories. A Transistor switch, which is used for opening or closing of a circuit, that means the transistor is commonly used as a switch in the electronic devices only for the low voltage applications because of its low power consumption.Transistor work as a switch when it is in cutoff and saturation regions. In this article, we will discuss how to use a transistor as a switch

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Transistor As A Switch

If the circuit uses the BJT transistor as a switch, then the biasing of the transistor, either NPN or PNP is arranged to operate the transistor at the both sides of the I-V characteristics curves shown below. A transistor can be operated in three modes, active region, saturation region and cut-off region. In the active region, transistor works as an amplifier. The two operating regions of transistor Saturation Region (fully-ON) and the Cut-off Region (fully-OFF) were used to operate a transistor switch.

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