A particle of mass m and positive charge q is released from point A. It's speed is found to be v, when it passed through a point B. Which of the 2 points is at higher potential? What is the potential difference between the points?
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A particle of mass m and positive charge q is released from point A. It's speed is found to be v, when it passed through a point B. Which of the 2 points is at higher potential? What is the potential difference between the points?
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Verified answer
Given,
A particle of mass m and positive charge q is released from point A. It's speed is found to be v, when it passed through a point B.
To find,
which of the 2 points is at higher potential ?
what is the potential difference between the points ?
concept : a positive charge always moves from higher potential to lower potential.
so if a positive charge particle moves from point A to point B, then definitely point A is at higher potential.
from work energy theorem,
workdone by electric field = change in kinetic energy of particle
⇒q ∆V = 1/2 mv² - 1/2 m (0)² = 1/2 mv²
⇒∆V = mv²/2q
Therefore potential difference between the points is mv²/2q.
Given :-
We know that ,
A positive ( + ) charge always moves from higher potential to lower potential.
Thus ,
If a positively charged particle moves from point A to point B , then it's obvious that — point A is at higher potential than that of B .
Now,
we know that,
A/c to WORK ENERGY THEORUM,