Define the units of (i) charge (ii) electric potential.
Define the units of (i) charge (ii) electric potential.
Ans: – (i) When 1C charge is placed at a distance of 1 m from an equal like charge then repeals with a of force of 9 × 109 N.
(ii) volt or electric potential is when 1C positive charge is brought from outside the field to a point against the field 1 J.
When a glass rod is rubbed with a piece of silk it acquires +10 micro coulomb of charge. How many electrons have been transferred from glass to silk?
Ans: –We know that number of electron= (coulomb charge/ 1.6×10^-19) = (10×10^-6 / 1.6×10^-19) = 6.25×10^13.
How will the force between two small electrified objects vary if the charge on each of the two particles is doubled and separation is halved?
Ans: –We know that electric force is inversely proportional to the distance^2 and directly proportional to charge. So, when the distance will be halved and charge is double then the force will be eight times.
How does the force between two small charged spheres change if their separation is doubled?
Ans: – If separation is double then the force will be 1/4th of the previous one.
A particle carrying a charge of 1 micro coulomb (μC) is placed at a distanceof 50 cm from a fixed charge where it has a potential energy of 10 J. Calculate
(i) the electric potential at the position of the particle
(ii) the value of the fixed charge.
Ans: – The electric potential is = (10/10^-6) =10^7.
The value of the fixed charge
= (10×0.5 / 9×10^-6×10^9).
= 5/9×10^-3C.
Two metallic spheres A and B mounted on two insulated stands as shown in the Fig. 16.4 are given some positive and negative charges respectively. If both the spheres are connected by a metallic wire, what will happen?
Ans: – The electron will flow from point B to point A. This flow will continue until the potential become equal.
- Follow on Facebook page – Click Here
- Google News join in – Click Here