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CBSE Class 12-science Answered

why we introduce the concept electric field in electrostatics ? give one benefit of it
Asked by nil.rudra2001 | 28 Jun, 2018, 04:30: PM
answered-by-expert Expert Answer
The term field in physics generally refers to a quantity that is defined at every point in space and may very from point to point. 
For electrostatics, the concept of electric fields is conveneient. Electric field is an elegant way of characterising the
electrical environment of a system of charges. Electric field at a point in the space around a system of charges tells us
the force a unit positive test charge would experiece, if placed at that point without didsturbing the system.
Electric field is a characterstic of the system of charges and is independent of the test charge that if we
place at a point to determine the field.
Answered by Thiyagarajan K | 29 Jun, 2018, 10:26: AM

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CBSE 12-science - Physics
solve option e
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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
which answer is correct and most appropriate with explanation
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8212
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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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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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