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Richa Sharma 7 years, 1 month ago

Itni sari books padhne ki koi jarurat nhi sirf ncert ke question practice kr...... Self study is must....

Pramita Das 7 years, 1 month ago

Also solve sl Aurora

Pramita Das 7 years, 1 month ago

? practice all the NCERT questions, do it over & over, try to solve hc Verma, read in details for moderns ABC & read the NCERT thoroughly so that you can't leave a single question but don't mug up.. read over & over & try to remember practice thoroughly... that's all...

3Thank You

ANSWER

A transmitting antenna at the top of the tower has a height of 20 m and the height of receiving antenna is 45 m. Calculate the maximum distance between them for satisfactory communication in LOS mode. (Given, Radius of Earth = 6.4 × 10^6 m).

Posted by Brahmjot Kaur 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Priyanka Malik 7 years, 1 month ago

d=root2×25×6.4×10^6 + root2×45×6.4×10^6

ANSWER

Should we make hand written project report or printed??

Posted by Ash Ash 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Abhay Singh Tomar 7 years, 1 month ago

U should make handwritten project

ANSWER

Suppose that the lower half of the concave mirror's reflecting surface is covered with an opaque material. What effect will this have on the image of an object placed in front of the mirror?

Posted by Khushi Singh 7 years, 1 month ago

CBSE > Class 12 > Physics

3 answers

Abhay Singh Tomar 7 years, 1 month ago

Sorry image

Abhay Singh Tomar 7 years, 1 month ago

It will have no effect on the insane

Brahmjot Kaur 7 years, 1 month ago

The position of the image is not affected, only the intensity of the image is reduced to half.

ANSWER

P n junction diode

Posted by Priyanshu Chauhan 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Brahmjot Kaur 7 years, 1 month ago

p-n junction diode is basically a p-n junction with metallic contacts provided at the ends for the application of an external voltage. It is a two terminal device.

ANSWER

How does an unpolarised light incident on a Polaroid gets polarized ? Describe briefly with the help of a necessary diagram, the polarization of light by reflection from a transparent medium.

Posted by Ashish Rana 7 years, 1 month ago

CBSE > Class 12 > Physics

2 answers

Abhay Singh Tomar 7 years, 1 month ago

For diagram see sl arora on page no. 10.52 & 10.53

Abhay Singh Tomar 7 years, 1 month ago

The Unpolarised light has many vibrations In all directions. The work of polaroid is to transmit only those vibrations which are parallel to it and it absorbs those vibrations which are perpendicular to it . After that the vibrations come out of the polaroid in the form of polarised light in which vibrations are assigned in one direction which are parallel to the polaroid.

ANSWER

What type of magnification occurs in simple microscope

Posted by Ria Bhagat 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Amandeep Kumar 7 years, 1 month ago

Linear magnification

ANSWER

What is the charge inclosed by Gaussian surface

Posted by Neha Tiwari 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Abhay Singh Tomar 7 years, 1 month ago

q/apsalyne not

ANSWER

How many devices to teach in 12th syllabus

Posted by Dheeraj Kumar 7 years, 1 month ago

CBSE > Class 12 > Physics

2 answers

Amandeep Kumar 7 years, 1 month ago

AC generator, transformer, simple microscope, compound microscope, telescope, human eye, meter bridge, potentimeter, lens, moving coil galvanometer, cyclotron,

Ashish Kumar 7 years, 1 month ago

Only one.. That is self practice

ANSWER

In SL Arora i read a line in which this was written. "The refractive index is independent of the angle of incidence"

Posted by Abhay Singh Tomar 7 years, 1 month ago

CBSE > Class 12 > Physics

2 answers

Amandeep Kumar 7 years, 1 month ago

Refractive index is the ratio of speed of light in air by speed of light in medium...... Matlab Tum light ko Kisi bhi angle se incident karao Iska validity me koi change nahi aaega...that is why it is independent of the Angle of incidence

3Thank You

Abhay Singh Tomar 7 years, 1 month ago

How is it possible anyone can tell

ANSWER

A sample con tain 1 tennis to the power 12 KG each of the two substances A and B with half life 4 second and its second their atomic weight are in the ratio 1 ratio 2 find the amount of A and B After 16 second

Posted by Trilok Rajput 7 years, 1 month ago

CBSE > Class 12 > Physics

0 answers

ANSWER

How can I prepare for physics board examination

Posted by Rekha Pal 7 years, 1 month ago

CBSE > Class 12 > Physics

7 answers

Shobha??? Kumari 7 years, 1 month ago

?????

Shobha??? Kumari 7 years, 1 month ago

Because i study 4 hours

Shobha??? Kumari 7 years, 1 month ago

I am getting 99marks in physics

Shobha??? Kumari 7 years, 1 month ago

Its your way

Amandeep Kumar 7 years, 1 month ago

I study phy for only 1 hours and I am getting good marks.......... 5 hours is more than enough

Abhay Singh Tomar 7 years, 1 month ago

Its not possible that a person can study physics only 5 hours

Shobha??? Kumari 7 years, 1 month ago

Daily study physics 5 hours

ANSWER

All Formula PDF

Posted by Prince Rai 7 years, 1 month ago

CBSE > Class 12 > Physics

0 answers

ANSWER

what is the effect on focal length of convex lens when dipped in water?

Posted by Aditya Singh 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Sanjay Singh 7 years, 1 month ago

Decreases

ANSWER

Prove Coulomb's law in vector form

Posted by Harish Pratap 7 years, 1 month ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Topics of assignments

Posted by Sumam Dosad 7 years, 1 month ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Plz give the video of distance of closest approach and impact parameter

Posted by Sonia Narang 7 years, 1 month ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Advantages of eddy currents

Posted by Navdeep Dhaliwal 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Yogita Ingle 7 years, 1 month ago

Electromagnetic damping : When a metallic frame or plate oscillates in a magnetic field (e.g. in a dead-beat galvanometer), the eddy currents generated in the frame or plate oppose the motion and bring the frame to rest as the oscillations die out quickly. This is called electromagnetic damping.

Magnetic braking : This is provided in electric trains by placing strong electromagnets above the rails. During braking, the metal wheels are exposed to a magnetic field from the electromagnets, generating eddy currents in the wheels. The magnetic interaction between the applied field and the eddy currents acts to slow the wheels down. The faster the wheels are spinning, the stronger the effect, meaning that as the train slows the braking force is reduced, producing a smooth stopping motion.

Electric power meters : The analogue electric power meter (presently most of the electric meters are digital) has a shiny metal disc. This disc rotates due to the eddy currents which are induced in the disc by varying magnetic fields produced by sinusoidally varying currents in a coil.

Induction furnace : In an induction furnace, high frequency alternating current is passed through a coil which surrounds the metals to be melted. The eddy currents generated in the metals produce high temperatures sufficient to melt it.

ANSWER

Real image of object is formed by a lens at a distance 60cm from it . How Will position of image change if another lens of focal length 20cm is brought in contact with the. Lens given that this lens is (a) converging (b) diverging

Posted by Tanish Garg 7 years, 1 month ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Sl aurora giude is good for physics in board level or some other guide

Posted by Jayaasrii?? Jayaasrii 7 years, 1 month ago

CBSE > Class 12 > Physics

5 answers

Khushi? Rana?? 7 years, 1 month ago

It is good but pradeep's fundamental physics is the best

Raj Shankar Shukla 7 years, 1 month ago

arihant is best

Shreya Bhardwaaj 7 years, 1 month ago

Value based question were neglected this year instead of value based 2 or 3 question were added

3Thank You

Shreya Bhardwaaj 7 years, 1 month ago

Sl is best dont go for any other solve sl and chapterwise too..

Avinash Kumar 7 years, 1 month ago

Good but you can make also arihant publication (concept of physics).this book is best and also help in board preparation. In this book given a topic wise questions and value based questions and also given that question which are asked in previous year in board.

ANSWER

Difference between AC and DC current....

Posted by Amandeep Kumar 7 years, 1 month ago

CBSE > Class 12 > Physics

7 answers

Amandeep Kumar 1 year, 11 months ago

Kaun sa massage megha...?

G K 1 year, 11 months ago

uska ans idhar hi bolna.....

G K 1 year, 11 months ago

really.....anyway thanks Amandeep.....did u get my msg....

Amandeep Kumar 1 year, 11 months ago

Phenomenal Explaination megha..??

G K 7 years, 1 month ago

1.) Graph....AC - upward and downward x-axis (like graph of sin ) DC - of constant manitude ......2.) AC - Safe to transfer over long distance bcz isme koi loss ni hota.......DC-Cant transfer so far becoz it loses energy........3.) AC- Frequency - 50Hz-60Hz .......DC-Frequency - zero .......4.) AC - power factor lies btw 0 to 1 .....DC-power factoralways 1......5.) AC - Flow of current is not in 1 direction , time ke saath vary hota h (see the graph)......DC- Flow in 1 direction , nd not vary with tym .......6.) AC- Obtained fm AC Generator .....DC- obtained fm cell/battery ............OR POINTS YAAD NI AA RHE........I hope itne kafi h.......

Amandeep Kumar 1 year, 11 months ago

Thora detail me bata bhai..... Megha ab app hi bata dijiye

Avinash Kumar 7 years, 1 month ago

Ac current is change its magnitude and direction with time but dc current does not change its magnitude and direction with time.

ANSWER

Plz help me in marks disribution for all chapter class 12th

Posted by Dwarka Prasad 7 years, 1 month ago

CBSE > Class 12 > Physics

0 answers

ANSWER

What is spherical abbrevation

Posted by Dayim Hasan 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Joshua M 7 years, 1 month ago

When light falls on the end of an optical device the image formed is imperfect. This inability of an optical instrument to form a clear image when light falls at it's edges apart from its center is termed as spherical aberration

ANSWER

difference between resistance and resistivity

Posted by Anshul Yadav 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Dayim Hasan 7 years, 1 month ago

Resistance is opposition of current in a circuit and resistivity is the property of a material which depend on nature and temprature

ANSWER

What is the marks pattern of each chapter in physics...

Posted by Hassanain Akram 7 years, 1 month ago

CBSE > Class 12 > Physics

0 answers

ANSWER

L-c oscillation

Posted by Rohit Tomar 5 years, 8 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

What is paraxial

Posted by Harshit Singh 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Yogita Ingle 7 years, 1 month ago

A paraxial ray is a ray that makes a small angle to the optical axis of the system, and lies close to the axis throughout the system. Such rays can be modeled reasonably well by using the paraxial approximation. The paraxial rays of light from the image at a longer distance from the lens than the marginal rays.