Plzzz solve the given numericals -
1. Two +very charges distant 0.1m apart, repel each other with a force of 18N. If the sum of the charges is 9 microcoulomb , then calculate the separate values.
2. Two point charges of +2 microcoulomb and +6 microcoulomb repel each other with a force of 12N . If each is given an additional charge of -4 microcoulomb, then calculate the new force.
rohit710:
little bit hard for me BUT i'll try
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Charged particles have energy due to their positions. A group of positively charged particles squeezed tightly together has just such energy. When released they will fly apart, converting the potential energy into kinetic. Two charges, Q and q separated by a distance r have electric potential energy
U = kQq/r where k = 9 x 109 . When r = infinity, U = 0.
Electric potential energy is the work required to bring charges from infinite separation to separation r.
ELECTRIC POTENTIAL
The charge , Q, causes every other charge, q, to have electric potential energy. Q is called the source charge as it is considered to be the cause of the electric potential energy, while q is called a test charge.
A common definition for electric potential is the work done per unit charge moving a test charge from infinity to a point in an electric field. The units are J/C, or volts (V).
V = U/q
Therefore, U = Vq
That is, the work done on every coulomb of charge of a test charge to bring it from infinity to at a distance r away from the source of the field is
V = kQ/r
The work done moving a charge, q, from one point with potential V1 to another point with potential V2in the field is
U = q(V2 -V1)
QUICK QUESTION
Consider a charged particle in an electric field. If the particle had twice the charge, which of the following statements would be true?
a. The electric potential energy and the electric potential would both be twice as great.
b. The electric potential energy would be twice as great and the electric potential would be the same.
c. The electric potential energy would be the same and the electric potential would be twice as great.
d. The electric potential energy and the electric potential would both be the same.
U = kQq/r where k = 9 x 109 . When r = infinity, U = 0.
Electric potential energy is the work required to bring charges from infinite separation to separation r.
ELECTRIC POTENTIAL
The charge , Q, causes every other charge, q, to have electric potential energy. Q is called the source charge as it is considered to be the cause of the electric potential energy, while q is called a test charge.
A common definition for electric potential is the work done per unit charge moving a test charge from infinity to a point in an electric field. The units are J/C, or volts (V).
V = U/q
Therefore, U = Vq
That is, the work done on every coulomb of charge of a test charge to bring it from infinity to at a distance r away from the source of the field is
V = kQ/r
The work done moving a charge, q, from one point with potential V1 to another point with potential V2in the field is
U = q(V2 -V1)
QUICK QUESTION
Consider a charged particle in an electric field. If the particle had twice the charge, which of the following statements would be true?
a. The electric potential energy and the electric potential would both be twice as great.
b. The electric potential energy would be twice as great and the electric potential would be the same.
c. The electric potential energy would be the same and the electric potential would be twice as great.
d. The electric potential energy and the electric potential would both be the same.
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