Potential Energy of Two Point Charges
Trending Questions
Q. A small metal sphere, carrying a net charge of q1=−2μC, is held in a stationery position by insulating supports. A second small metal sphere, with a net charge of q2=−8μC and mass 1.50 g is projected towards q1. When the two spheres are 0.800m apart, q2 is moving towards q1 with speed 20 ms−1 as shown in the figure. Assume that the two spheres can be treated as point charges. You can ignore the force of gravity.![](https://s3-us-west-2.amazonaws.com/infinitestudent-images/ckeditor_assets/pictures/605517/original_Q16.png)
How close does q2 get to q1?
![](https://s3-us-west-2.amazonaws.com/infinitestudent-images/ckeditor_assets/pictures/605517/original_Q16.png)
How close does q2 get to q1?
- 0.20 m
- 0.30 m
- 0.10 m
- 0.15 m
Q. Four identical charged particles having same mass are located at four corners of a regular tetrahedron. If only one of the particles is released, with the remaining tetrahedron fixed, it acquires a final speed of Vo. If all the charges are released together, their final speed will be Von, then n is
Q. Two insulating plates are uniformly charged in such a way that potential difference between them is V2 − V1 = 20 V. Plates are separated by d=0.1 m. An electron is released from rest in between the plates from the surface of plate 1. What is its speed when it hits the plate 2?
(Charge on an electron, e=−1.6×10−19 C and mass of an electron, me=9.1×10−31 kg)
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1133066/original_25.png)
(Charge on an electron, e=−1.6×10−19 C and mass of an electron, me=9.1×10−31 kg)
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1133066/original_25.png)
- 1.87×106 m/s
- 32×10−19 m/s
- 7.02×1012 m/s
- 2.65×106 m/s
Q.
There are two point charges of +1C each separated by 10m in vacuum. Calculate the change in potential energy of the system if they are brought to a separation of 5m.
9×109J
9×108J
9×107J
None