Explanation
If electric lines of forces cross each other, then the electric field at the point of intersection will have two direction simultaneously which is not possible physically
Charge is always conserved but energy is lost in the term of heat.
It is an example of conservation of charges.
Potential is constant on the surface of a sphere so it behaves as an equipotential surface.
A charged cloud induces opposite charge on pointed conductors. At sharp points of the conductor surface density of charge is very high and charge begins to leak
from the pointed ends by setting up oppositely charged electric wind. This wind, when comes in contact with the charged cloud, neutralizes some of its charge lowering the potential difference between the cloud and the building. This reduces the chances of lightening striking the building [if the lightening strikes the building, the charge is conducted to the earth and the building remains safe].
When the bird perches on a single high power line, no current passes through its body because its body is at equipotential surface i.e., there is no potential difference. While when man touches the same line, standing bare foot on ground the electrical circuit is completed through the ground. The hands of man are at high potential and his feet’s are at low potential. Hence, large amount of current flows through the body of the man and person, therefore gets a fatal shock.
During take off and landing, the friction between tyres and the run way may cause electrification of tyres. Due to conducting nature of tyre, the charge so collected is conducted to a ground and electrical sparking is avoided.
Electric potential of a charged conductor depends not only on the amount of charge and volume hut also on the shape of the conductor. Hence, if their shapes are different, they may have different electric potential.
Since the electric field is directed from south to north hence rate of change of potential will be along this direction, but it is zero along east and west.
Electric field at the nearby point will be resultant of existing field and field due to the charge brought. It may increase or decrease if the charge is positive or negative depending on the position of the point with respect to the charge brought.
The charged particle could be positive or negative. The positive charge will move in the direction of the field. But negative charge will move opposite to the field.
In the direction of electric field, potential decreases.
Electric field is directed right ward (higher potential of –200 V to lower potential of –400 V). When electron left free in an electric it accelerates opposite to the electric field. Hence, in the given case electron accelerates left ward.
Metal plate acts as an equipotential surface, therefore the field lines should enter normal to the surface of the metal plate.
The same force will act on both bodies although their directions will be different.
We put a unit positive charge at 0. Resultant force due to the charge placed at A and C is zero and resultant charge due to B and D is towards D along the diagonal BD.
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