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

Because if electric field is not perpendicular to surface it have 2 components horizontal and vertical due to which, we doing work to move charge on surface against these components. But on potensial surface ∆w =0 therefore E field always perpend.to equ.potential surface

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What is stopping potential?

Posted by Sumit Ingale 6 years, 11 months ago

CBSE > Class 12 > Physics

2 answers

Rohit Kumar 6 years, 11 months ago

It can be defined as incresing the +ve potential of A with respect potential B -ve. Due to which electrons comes from metal surface become slow. This is known as stopping potential . It is directly related to intensity of light.

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Yogita Ingle 6 years, 11 months ago

Stopping potential: The minimum negative potential given to the anode of a photocell for which the photoelectric current becomes zero is called stopping potential.
(i) The increase of frequency of incident radiation has no effect on the photoelectric current.
(ii) The photoelectric current increases proportionally with the increase in intensity of incident radiation.

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ANSWER

Xam idea sample paper

Posted by Badmash Jaat 6 years, 11 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Is blue print for class 12th can be trusted fully

Posted by Shivam Sharma 6 years, 11 months ago

CBSE > Class 12 > Physics

3 answers

Shivam Sharma 6 years, 11 months ago

Is one can fully trust on blue print

1Thank You

Tikishree Menaka Murmu 6 years, 11 months ago

Approximately yes.........

2Thank You

Aryan Rai 6 years, 11 months ago

Yes brother

1Thank You

ANSWER

Difference between voltage and current

Posted by Shaikh Umar 6 years, 11 months ago

CBSE > Class 12 > Physics

1 answers

Yogita Ingle 6 years, 11 months ago

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Voltage, also called as electromotive force is simply the energy per unit charge. In other words, voltage is the difference in electric potential between two points.	Current is just the rate of flow of electric charge. In simple words, current is the rate at which electric charge flows in a circuit at a particular point.
The SI unit of voltage is Volts (V). Note: 1 Volt= 1 Joule/coulomb.	The SI unit of current is Ampere (A). Note: 1 Ampere = 1 coulomb/second.
Voltage is denoted by “V”.	Current is denoted by “I”.
Voltage can be measured by using a Voltmeter.	Current can be measured by using an Ammeter.
Voltage is the cause of the current.	Current is the effect of the voltage i.e. current cannot flow without voltage.
One of the formulas to calculate voltage is: V= Work done/Charge	One of the formulas to calculate current is: I= Charge/ Time
Loss of voltage occurs due to impedance.	Loss of current occurs due to the passive elements.
Voltage creates an electrostatic field.	Current creates a magnetic field.
In a series connection, voltage changes i.e. it gets distributed over all the components.	In a series connection, the current remains same through all the components.
In a parallel connection, the voltage remains same across all the components.	In a parallel connection, current changes i.e. it gets distributed over all components.

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How we can define voltage and current

Posted by Shaikh Umar 6 years, 11 months ago

CBSE > Class 12 > Physics

1 answers

Yogita Ingle 6 years, 11 months ago

Voltage: Voltage, also called as electromotive force is simply the energy per unit charge. In other words, voltage is the difference in electric potential between two points. Voltage can be measured by using a Voltmeter.
Current ; Current is just the rate of flow of electric charge. In simple words, current is the rate at which electric charge flows in a circuit at a particular point. Current can be measured by using an Ammeter.

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ANSWER

Current electricity chapter important topics plzzz

Posted by Navya Singh 6 years, 11 months ago

CBSE > Class 12 > Physics

1 answers

Shaikh Umar 6 years, 11 months ago

Drift velocity , potentiometer, relations b/w ohms law and drift velocity Wheatstone bridge

2Thank You

ANSWER

what is doping?

Posted by Mayur Prajapat 6 years, 11 months ago

CBSE > Class 12 > Physics

4 answers

Rohit Kumar 6 years, 11 months ago

A process to change intresic semiconductor into extrensic semiconductor by adding some impurity is known as doping

0Thank You

Shaikh Umar 6 years, 11 months ago

Adding of impurities which gives rise to conductivity of material due to extra presence of electron

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Yogita Ingle 6 years, 11 months ago

The conductivity of metal is increased by adding an appropriate amount of suitable impurity.
This process is known as doping.
It can be performed with an impurity which is electron rich or electron deficient than the intrinsic semiconductor silicon or germanium.

1Thank You

Saumya Agrawal 6 years, 11 months ago

The process of adding impurities to the pure semiconductor is termed as doping...

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ANSWER

Why do we consider the direction of flow of current as the direction of current?

Posted by Saurabh Yadav 6 years, 11 months ago

CBSE > Class 12 > Physics

3 answers

Saurabh Yadav 6 years, 11 months ago

Basically I am asking why do we consider the direction of flow of protons as the direction of flow of current? we know that protons are fixed not mobile like electrons.

0Thank You

Shaikh Umar 6 years, 11 months ago

Please check the question

0Thank You

Saumya Agrawal 6 years, 11 months ago

I could not understand the question..

1Thank You

ANSWER

How to write answers in boards

Posted by Virendra Paikra 5 years, 8 months ago

CBSE > Class 12 > Physics

3 answers

Mansi Sharma 6 years, 11 months ago

With good handwriting and to the point answers i.e; only required answer should be given

0Thank You

Rajat Dhull 6 years, 11 months ago

U can use black and blue pen but not red and green.

1Thank You

Manan Bedi 6 years, 11 months ago

With pen

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ANSWER

What are the uses of Spectrometer?

Posted by Tikishree Menaka Murmu 6 years, 11 months ago

CBSE > Class 12 > Physics

1 answers

Shaikh Umar 6 years, 11 months ago

To study the nature and properties of elements

1Thank You

ANSWER

What is the correct manner to write the practicals??

Posted by Monika Gautam 6 years, 11 months ago

CBSE > Class 12 > Physics

1 answers

Abhi Abhi 6 years, 11 months ago

Write in a neat and good handwriting so that the corrector should believe that you are a good student. Make it sure that your observations graphs and records should be neat and clear.

4Thank You

ANSWER

In project writing can we use blue pen

Posted by Soham Sarkar 6 years, 11 months ago

CBSE > Class 12 > Physics

4 answers

Rajat Dhull 6 years, 11 months ago

Or kaun sa krega blue hi hota hai

1Thank You

Shaikh Umar 6 years, 11 months ago

As your wish

0Thank You

Saurabh Yadav 6 years, 11 months ago

Yes U can

0Thank You

Navya Singh 6 years, 11 months ago

Yeah

2Thank You

ANSWER

Dudes date sheet aa gai hai... Check it out Physics me gap kam hai

Posted by Bipin Joshi 6 years, 11 months ago

CBSE > Class 12 > Physics

6 answers

Bhisham Gora 6 years, 11 months ago

OK... I am sorry saumya

0Thank You

Bipin Joshi 6 years, 11 months ago

Ya we have hindi in mid. Of physics and chemistry

0Thank You

Saumya Agrawal 6 years, 11 months ago

Wait i think 9 march ko hindi ka paper h ...

4Thank You

Aryan Rai 6 years, 11 months ago

@Bhisham.. perhaps Saumya has a different subject combination.

0Thank You

Bhisham Gora 6 years, 11 months ago

saumya... Plz check the datesheet again coz 5 March physics and on 12 March we have chemistry exam so there is good gap in between the exam

1Thank You

Saumya Agrawal 6 years, 11 months ago

And in chemistry also there is only two days gap

1Thank You

ANSWER

What is difference between emf and voltage

Posted by Dodiyar Ravishankar 6 years, 11 months ago

CBSE > Class 12 > Physics

2 answers

Saurabh Yadav 6 years, 11 months ago

Emf means the true potential difference across a battery or likewise ,Do note that here we assume that there is no resistance. While voltage means the potential difference measure across any load( resistance :-)

1Thank You

Tikishree Menaka Murmu 6 years, 11 months ago

Emf produces voltage in electric sources and voltage is differences of potential difference of two points

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Wtf

Posted by Shivang Katiyar 6 years, 11 months ago

CBSE > Class 12 > Physics