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CBSE Class 12-science Answered

what's static electricity?
Asked by champ9462114424 | 19 Apr, 2019, 12:25: PM
answered-by-expert Expert Answer
Static means not moving. Static electricity is an electrical charge that doesn't move.
 
All materials are made up of atoms. An atom is the smallest particle of a material .
In an idle state, the positive charge of the nucleus is equal to the sum of the negative charge of the electrons
moving around the same nucleus in atm,. Therefore the charge is neutral in materials.
If the nucleus loses or gains electrons, an imbalance is caused.
An atom that has lost one or more electrons then has a positive charge,
and an atom that has gained one or more electrons has a negative charge 

Static electricity is a surface phenomenon and is generated when two or more surfaces come into contact
with one another and are separated again. This causes a sort of splitting, or a transfer of negative electrons
from one atom to the other causing charge development at surface.Due to this charge accumulation , surface develops elctrical potential. 
 
Hence sparking, attraction of opposite charges  and repulsion of similar charges from other materials are occuring
Answered by Thiyagarajan K | 19 Apr, 2019, 03:04: PM

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CBSE 12-science - Physics
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Asked by dasrituparna1999 | 13 Apr, 2024, 06:56: AM
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CBSE 12-science - Physics
The number of moles in an elemental sample is just the ratio of the mass m to atomic mass 4. n= A The number of protons N, in an elemental sample is Z (atomic number) times the number of moles of Avogadro's number NA N=ZnN P A Copper has an atomic mass of 63.5 g/mole and 29 protons per atom. If such an atom were neutral, then it would have as many protons as electrons. If you remove electrons from a neutral state, then you get a net positive charge. Given a 54 gram ball of copper with a net charge of 2.2 µC, what fraction of the copper's electrons have been removed?
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CBSE 12-science - Physics
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13./A point charge of 12 µC is located at the centre of a cube of side 1 m. Calculate the electric flux through each face of the cube. (H.S.S.C.E.1999~S) [Ans. 2.26\times10^{5}N~m^{2}C^{-1}]
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CBSE 12-science - Physics
A coil of N turns is placed in a magnetic field B such that B is perpendicular to the plane of the coil. B changes with time as B=B0 cos 2元 where T is time period. The magnitude of emf-induced in the coil will be maximum at
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CBSE 12-science - Physics
a charge of 2microcoulomb experience a force of 6N when placed at a point in an electric field .find electric field at that point
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