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2021-08-11 15:17:02 Electric Charges and Fields

NCERT PICKS

There is a spark or crackle when we take off oursynthetic clothes or sweater in dry whether.

It is observed that if two glass rods rubbed with wool or
silk cloth are brought close to each other, they repel each
other.

On rubbing two body, the mass of one body slightly get
lowered.

An ebonite rod held in hand can be charged by rubbing
with funnel but a copper rod cannot be charged like this.

When we touch a pith ball with an electrified plastic rod,
some of the negative charges on rod are transferred.

While calculating the force between the two charges
from coulomb's law, never take into account, the sign of
two charges. It just indicates nature of the force.

The test charge used to measure electric field at point is
taken as unit in magnitude or very small.

Field lines are always directed from higher potential to lower potential.

Neutral point is a point where resultant electric field is
zero.

When a charged particle enters with velocity at right
angle to the uniform field the trajectory is parabola.

A surface having same electric potential at every point is an equipotential surface.

Work done in moving a charge along an equipotential
surface is always zero.

Relative permitivity of the material is also known as
specific inductive capacitance.

Two charged spheres having Open / Comment

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2021-08-10 19:40:59 Important NCERT Picks of the Chapter "The Living World"

Nomenclature
• Binomial nomenclature system given by Carolus Linnaeus. Each name has two components – the generic name and the specific epithet.

• We know the plants and animals in our own area by their local/ vernacular names but these local names would vary from place to place, even within a country that can create a lot of confusion. Thus, it is a need to standardize the naming of living organisms such that a particular organism is known by the same single name all over the world.

• Nomenclature or naming is only possible when the organism is described correctly and we know to
what organism the name is attached to. This is called identification.

• Tautonyms: If both generic and specific names are same,
these are called tautonyms. e.g., Rattus rattus

• Nomenclature: Standardize the naming of living organisms

For Naming of Plants
International Code for Botanical Nomenclature (ICBN).

For Naming of Animals
International Code of Zoological Nomenclature (ICZN). Open / Comment

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