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Van de graaff generator is used to generate high voltages of the order of a few million volts. This results in generation of large electric fields for experimental purposes.

Principle

The inner sphere has a higher potential than outer if the charge q is positive.
If the two spheres are connected through a wire, the charge will flow from high to low potential.
Thus, providing smaller potentials at the inner sphere will keep building large amount of charge at the outer sphere, till the breakdown field of air (3 x 106 V/m) is reached.
This accumulates close to millions of volts.

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A block of mass 10kg is kept on a horiz ontal surface. A force F is acted on the block .for what minimum value of F, the block will be lifted up?

Posted by Rubina Parveen 6 years, 1 month ago

Entrance Exam > JEE main > Physics

6 answers

Anurag Chaturvedi 6 years ago

If g= 9.8 then answer 98 If g= 10 then answer 100

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Pratham Bindal 6 years, 1 month ago

100+fsina

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Ankit Garg 6 years, 1 month ago

Incomplete ques

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Ashish Gupta 6 years, 1 month ago

98N

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Mukesh Devi 6 years, 1 month ago

98N

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Ankit Chauhan 6 years, 1 month ago

100

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What is gas constant?

Posted by Rimeki Lyngdoh Mawphlang 6 years, 2 months ago

Entrance Exam > JEE main > Chemistry

2 answers

Deepak Gupta 6 years, 1 month ago

amount of mechanical work done to raise temp. by one kelvin

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Nehaar Stylish 6 years, 1 month ago

R/m

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Posted by Phutin Duat 6 years, 2 months ago

Entrance Exam > JEE main > Syllabus and Papers

0 answers

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A block of mass m suspended by light thread from elevator . The elevator is a celerated downward from rest with uniform acceleration a(<g) . The magnitude of work done by tension in thread on the block

Posted by Ankit Chauhan 6 years, 2 months ago

Entrance Exam > JEE main > Physics

1 answers

Gaurav Seth 6 years, 2 months ago

A block of mass m is suspended by a light thread from an elevator. the elevator is accelerating upward with uniform acceleration ‘a’.
we know, Newton's law doesn't valid in non-inertial frame of reference. so, we have to add Psuedo force just opposite direction of it motion to make inertial frame of reference.
so, tension in the thread = mg + ma→ [ Psuedo force]
tension = m(g + a)

now, we have to find displacement of elevator.
use formula, S = ut + 1/2 At²
here A is net acceleration acts on elevator.
here u = 0, A = a [ upward direction]
so, S = 0 + 1/2 at²
hence, displacement is 1/2at²

now, workdone = Tension × displacement
= m(g + a) × 1/2 at²
= 1/2 m(g + a)at² Joule

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What is ionisation energy

Posted by Himansu Behera 6 years, 2 months ago

Entrance Exam > JEE main > Chemistry

2 answers

Monika Chauhan 6 years, 1 month ago

The amount of energy required to remove electron from isolated gaseous atom

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Yogita Ingle 6 years, 2 months ago

The energy required to remove an electron from a neutral isolated gaseous stom and convert it into a positively charged gaseous ion is called ionisation energy or first ionisation energy.
Ionisation energy required to remove the second electron from a monovalent cation is called second ionization energy.
Similarly, the energy required to remove the third electron from a divalent cation is called the third ionisation energy.

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Chemical reaction

Posted by Sunitha Kushi 6 years, 2 months ago

Entrance Exam > JEE main > Syllabus and Papers