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

Assume a cross sectionally circular conductor or better a circular conducting loop with static charges along its circumference. Since the charges are static this implies the current is zero(The surface of the conductor is an equipotential surface),if there is no flow of current then the charges DO NOT experience a force(Tangential) that makes them drift(along the circumference). This absence of a force(Tangential) implies that the electric field lines from the accumulated charges are oriented such that they do not exert a force on fellow charges,this is only possible for an electric field that is perpendicular to the curved surface of the loop at all points(That is ,there is no tangential component of Electric Field and only Normal Component Exists).

1Thank You

ANSWER

What r the dark and bright fringes . Explain in brief .

Posted by Mansi Sharma 7 years, 3 months ago

CBSE > Class 12 > Physics

1 answers

Friendly Rao 7 years, 3 months ago

Dark and bright fringes are formed when light spreads in all directions. Bright fringes always form constructive interference and dark fringes always form destructive interference.

1Thank You

ANSWER

What is displacement current.

Posted by Tayyabar Rahman Khan 7 years, 3 months ago

CBSE > Class 12 > Physics

1 answers

Nargish Pater 7 years, 3 months ago

The current btw the plates of a capacitor is the displacement current. In actual the current which flow in the circuit from any source, when enters capacitor plates then that current is named as displacement Current.

1Thank You

ANSWER

Explain displacement law when alpha,beta,gamma rays emitted

Posted by Sri Vardhan 7 years, 3 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Which material is used for the meter bridge wire and why ?

Posted by Gulshan Netam 7 years, 3 months ago

CBSE > Class 12 > Physics

1 answers

Rajat Dhull 7 years, 3 months ago

Manganin used bcz of high temperature coff. Of resistivity.

0Thank You

ANSWER

What is the energy of a photon in eV corresponding to the visible light of maximum wavelength.

Posted by Gangeshver Sharma 7 years, 3 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Power loss is equal to P=I^2Rt=V^(2)t/R but how resistance vary (proportional) with power either inversely or directly.

Posted by Rajat Dhull 7 years, 3 months ago

CBSE > Class 12 > Physics

2 answers

Rajat Dhull 7 years, 3 months ago

Is it given in question that I or V is constant. Please reply

1Thank You

Anjana Sherawat 7 years, 3 months ago

If I is constant then directly and if V is constant then inversely

2Thank You

ANSWER

How to say physics sign

Posted by Belal Khan 7 years, 3 months ago

CBSE > Class 12 > Physics

1 answers

Rajat Dhull 7 years, 3 months ago

You have to just say ''physics sign'' . Kya yaar kya parsan poochta hai.

0Thank You

ANSWER

Expain PN junction diode...

Posted by Kanhaar Vaishya 7 years, 3 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

How many of you completed your syllabus fully

Posted by Ashutosh Kumar 7 years, 3 months ago

CBSE > Class 12 > Physics

5 answers

Deepti Choudhary 7 years, 3 months ago

All Subjects...

0Thank You

Shobha??? Kumari 7 years, 3 months ago

???

0Thank You

Shobha??? Kumari 7 years, 3 months ago

Physics ,chemistry and bio are complete yrrr

1Thank You

Aditi Varshney 7 years, 3 months ago

Only eng and comp science fully?

1Thank You

Mansi Sharma 7 years, 3 months ago

Only maths is completed !!!Dude .

3Thank You

ANSWER

What is electrical potential?

Posted by Shivani .. 7 years, 3 months ago

CBSE > Class 12 > Physics

1 answers

Vijay Pandit 7 years, 3 months ago

An electric potential is the amount of work needed to move a unit of positive charge from a reference point to a specific point inside the field without producing an acceleration.

5Thank You

ANSWER

Draw the ray daigaram for the formation of image of object placed at between f and p. Also write potision,size and natur of the image.

Posted by Rehan Alam 7 years, 3 months ago

CBSE > Class 12 > Physics

1 answers

Nargish Pater 7 years, 3 months ago

Position-on the other side of the mirror, size - magnified, nature erect and virtual See dig. From pardeep^s book vol. 2 in topic lens forrmula

2Thank You

ANSWER

What is the term 'activity' of a radioactive substance.

Posted by Vijay Pandit 7 years, 3 months ago

CBSE > Class 12 > Physics

1 answers

Aayush Nagar 7 years, 3 months ago

It means the disintegration of radioactive substance with time

2Thank You

ANSWER

In normal case emitter base junction is forward biased and collector base junction is reverse biased what will happen if emitter is reverse biased and collector is forward biased?

Posted by Bala Mani 7 years, 3 months ago

CBSE > Class 12 > Physics

1 answers

Manish Yadav 7 years, 3 months ago

If u do it then current will not flow due to offer of high resistence at emmiter terminal just like a diode

1Thank You

ANSWER

Can i get class 12 question 2018 delhi board

Posted by Aditya Thakur 7 years, 3 months ago

CBSE > Class 12 > Physics

1 answers

Rajneesh Pandey 7 years, 3 months ago

No due to in 2018 common paper circulated

2Thank You

ANSWER

What are dark currents?

Posted by Devyanshi Khandelwal 7 years, 3 months ago

CBSE > Class 12 > Physics

2 answers

Sudipto Mandal 7 years, 3 months ago

The minor charge carrier helps the current to flow and produces dark current

1Thank You

Sudipto Mandal 7 years, 3 months ago

Dark current is the current produced when p-n junction diode is placed in reversed bias

1Thank You

ANSWER

in semiconductors what are holes actually

Posted by Riteeka Sehrawat 7 years, 3 months ago

CBSE > Class 12 > Physics

2 answers

Vijay Pandit 7 years, 3 months ago

When an elctron replace their place,there is a empty space remains,which is called holes.

1Thank You

Fatima Zohra 7 years, 3 months ago

Positron

5Thank You

ANSWER

Which component E or B of an eM wave is responsible for visible effect?

Posted by Abdul Rafique 7 years, 3 months ago

CBSE > Class 12 > Physics

2 answers

Shubham Sharma 7 years, 3 months ago

E wVe

1Thank You

Rohit Gurjar 7 years, 3 months ago

Dekho bhai humme ni pta

1Thank You

ANSWER

5 difference between diamagnetism , paramagnetism, and ferromagnetism.

Posted by Harsh Choudhary 4 years, 9 months ago

CBSE > Class 12 > Physics

1 answers

Sia ? 4 years, 9 months ago

Properties	Ferromagnetic Materials	Paramagnetic Materials	Diamagnetic
State	They are solid.	They can be solid, liquid or gas.	They can be solid, liquid or gas.
Effect of Magnet	Strongly attracted by a magnet.	Weakly attracted by a magnet.	Weakly repelled by a magnet.
Behavior under non-uniform field	tend to move from low to high field region.	tend to move from low to high field region.	tend to move from high to low region.
Behavior under external field	They preserve the magnetic properties after the external field is removed.	They do not preserve the magnetic properties once the external field is removed.	They do not preserve the magnetic properties once the external field is removed.
Effect of Temperature	Above curie point, it becomes a paramagnetic.	With the rise of temperature, it becomes a diamagnetic.	No effect.
Permeability	Very high	Little greater than unity	Little less than unity
Susceptibility	Very high and positive	Little greater than unity and positive	Little less than unity and negative
Examples	Iron, Nickel, Cobalt	Lithium, Tantalum, Magnesium	Copper, Silver, Gold