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

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Aseem Mahajan 2 years ago

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Aditya Dubey 2 years, 1 month ago

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Khushbu Yadav 2 years, 1 month ago

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ANSWER

Important questions from ray optics

Posted by Sameer Tyagi 2 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Naman Kumar 2 years, 1 month ago

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Two identical positive charges repel each other with a forces 15N places in free space at a distance of 30 cm .Find the magnitude of each charge

Posted by Deepuliya Chettri 2 years, 1 month ago

CBSE > Class 12 > Physics

2 answers

Rasel Ahmed 2 years, 1 month ago

Q=√15×(30×10^-2)^2 ÷ 9×10^9

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Sapna Desai 2 years, 1 month ago

15 × 10^-11 C

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An infinite line of charge has a linear charge density of 10-7 C/m. What will be the magnitude of the force acting on an alpha particle placed at a distance of 4 cm from the line of charge?

Posted by Abhishek Kumar 2 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Pragya Singh Pragya Singh 2 years ago

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What is statics

Posted by Bipindrq Harijan 2 years, 1 month ago

CBSE > Class 12 > Physics

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assertion in photoelectron emission the velocity of electron ejected from near the surfaces l is larger than that coming from interior of metal

Posted by Ravichandran Kumar 2 years, 1 month ago

CBSE > Class 12 > Physics

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Force of Attraction between 2 point electric charges place at a distance d in a medium is F. what distance apart should this be kept in the same medium So that force becomes f/3

Posted by Bisesta Pradhan 2 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

अर्णव पटेल 2 years, 1 month ago

D=d√3

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What is a rectifier ?

Posted by Shubham Tandi 2 years, 1 month ago

CBSE > Class 12 > Physics

3 answers

Dharmender Sehrawat 2 years, 1 month ago

Rectifier converts ac into dc

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Neha Yadav 2 years, 1 month ago

Rectifier is a type of electronic device which convert Ac into dc current

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Shubham Tandi 2 years, 1 month ago

What is a rectifier

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Prove that the speed of election in the ground sate of hydrogen atom is equal to the speed of electron in the first excited state of hydrogen like Li ++ atom.

Posted by Shivoham Sharma 2 years, 1 month ago

CBSE > Class 12 > Physics

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ANSWER

A temperature difference of 45°C is equivalent to a temperature difference of:

Posted by Gitanjali Kumar 2 years, 1 month ago

CBSE > Class 12 > Physics

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The radii of curvature of a double convex lens are 15cm and 25cm and it's refractive index is 1.5, calculate it's power.?

Posted by Lan Shylla 2 years, 2 months ago

CBSE > Class 12 > Physics

2 answers

Aarti Sangwan 2 years, 2 months ago

R1=15cm R2=-25cm Using lens maker formula P=1/f =(n-1) (1/R1-1/R2) P=1/f= (1.5-1) (1/15+1/25) P=1/f= (0.5) (8/75) P=1/f= 4/75 P=400/75 (multipy by 100 as R are in cm)

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Prakash Kumar 2 years, 2 months ago

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The radii of curvature of the face of a double convex lens are 20cm and 30cm.its power is 25/ 6 D . What is the refractive index of the glass of the lens?

Posted by Pinyo Namchoom 2 years, 2 months ago

CBSE > Class 12 > Physics

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A small object lies at the bottom of a vessel filled with water (refractive index4/3)up to a height H.When viewed from a point above the surface of water ,the object appears raised by n percent of H .The value of n is

Posted by Radha Kaushik 2 years, 2 months ago

CBSE > Class 12 > Physics

1 answers

Shubham And Shivam 2 years, 1 month ago

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Sir moving charges and magnetism ka notes kha par milega

Posted by Bharat Singla 2 years, 2 months ago

CBSE > Class 12 > Physics

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Formula of electric field

Posted by Anuja Ajagekar 2 years, 2 months ago

CBSE > Class 12 > Physics

2 answers

Kartik Kumawat 2 years, 1 month ago

E=KQ/r^2

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Shanika Sharma 2 years, 2 months ago

1/4πeplemlo q/r²

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What is electric fluc

Posted by Rahul Kumar Singh 2 years, 2 months ago

CBSE > Class 12 > Physics

2 answers

Shivansh Chaurasiya 2 years, 2 months ago

No of electric field passing perpendicular to a surface

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Ashima Dhiman 2 years, 2 months ago

No of lines passing perpendicular through a surface

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Which one the carrier of charge in case of solid, liquid and gas write down the mechanism of current flow by deriving different velocity in a conductor .

Posted by Chandu Mandal 2 years, 2 months ago

CBSE > Class 12 > Physics

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What two differences between para ,dia and ferromagnetic materials,giveing one example for each

Posted by Punit Meena 2 years, 2 months ago

CBSE > Class 12 > Physics

1 answers

Shivansh Chaurasiya 2 years, 2 months ago

Ferromagnetic materials are strongly attracted to both poles of magnets. Paramagnetic materials are weakly attracted to a single pole. Diamagnetic materials repel both poles of magnet

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Explain why? 1) 500 joules of work is done on a gas to reduce its volume by compression adiabatically.what is the change in internal energy of the gas?

Posted by Lakshmi Prasanna 2 years, 2 months ago

CBSE > Class 12 > Physics

1 answers

Rahul S 2 years, 2 months ago

In thermodynamics, the first law (which is essentially the law of conservation of energy) states that the change in internal energy of a system is equal to the heat added to the system minus the work done by the system on the surroundings. Mathematically, it is written as: ΔU = Q - W - ΔU is the change in internal energy of the system. - Q is the heat added to the system. - W is the work done by the system on its surroundings. For an adiabatic process, no heat is exchanged with the surroundings, which means Q = 0. Therefore, the equation simplifies to: ΔU = -W However, in this case, you are compressing the gas, meaning you are doing work on the gas, not the other way around. The sign convention for work in thermodynamics can be a bit counterintuitive: work done on the system is considered positive, and work done by the system is negative. Therefore, the work you've done on the gas, 500 joules, is positive from the perspective of the gas. So, for the gas being compressed adiabatically: W (on the gas) = 500 joules Therefore, the change in internal energy (ΔU) will be equal in magnitude but positive, since no heat is being added or removed: ΔU = 500 joules Thus, the internal energy of the gas increases by 500 joules. This increase in internal energy can result in an increase in temperature of the gas since the energy is not being used to do work by the gas or being lost as heat to the surroundings.

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An a-particle is accelerated through a potential difference of 10 kV and moves along x-axis. It enters in a region of uniform magnetic field B = 2 × 10-3 T acting along y-axis. Find the radius of its path. (Take mass of a-particle = 6.4 x 10-27 kg

Posted by Nikita Kanoo 2 years, 2 months ago

CBSE > Class 12 > Physics