Current flows when
(A) the potential of a body is very high
(B) the potential of a body is very low
(C) placed near a body of low potential
(D) placed in contact with a body of different potential
Answers
Answer:
Electrons, which continuously move in wire, are called Electric Current. ... Current flows from positive to negative and electron flows from negative to positive. Current is determined by the number of electrons passing through a cross-section of a conductor in one second
Explanation:
Why does a positively charged body has high potential and a negatively charged body has low potential?
Before we answer this, we have to be clear about “potential for what ?”. And “potential for whom ?”.
To the first part, it is potential for “doing work” and for the 2nd part, “by a unit positive charge”.
So basically the notion of potential is in terms of the potential energy that a unit positive charge would have near a positive or negative charge.
When a unit positive charge is brought near another positive charge, it needs work to be done to bring them closer (coz positive charges repel) and the amount of work done to bring the charges closer is what is stored in the test charge in the form of potential energy. Given a chance, the test charge would loose the potential energy into kinetic energy and just fly away from the positive charge.
On the other hand, the unit positive charge automatically gets attracted to a negative charge, therby loosing potential energy, converting it into kinetic energy thus gaining speed.
In the first case the unit charge gains potential energy (while approaching a positive charge) and looses potential energy (while approaching the negative charge). That’s how charges have been segregated into positive and negative.