In the figure, an α-particle moves a distance l in a uniform electric field E as shown. Does the Electric Field do a positive or a negative work on the α-particle? Does the electric potential energy of the α-particle increase or decrease?
Negative, increases
An α-particle (positively charged) moves opposite to the direction of the electric field. The electric force acting on it is in the direction of the field, meaning the field does negative work on the particle. Since work done by the field is negative, the electric potential energy of the α-particle increases. Thus, the correct answer is (a).
Important Questions from Electric Charges and Fields
Which of the following options is correct by using Coulomb's law?
Which of the following statements are correct?
- A. The angle at minimum deviation of a prism is greater for violet light than that for red light.
- B. The purpose of microscopes and telescopes is to increase the visual angle.
- C. For the diffraction to take place, the size of aperture or of the obstacle should be comparable to the wavelength of light.
- D. The light scattered in the direction of the incident light is always plane polarized.
- E. The source and its virtual image can behave as coherent sources.
Choose the correct answer from the options given below:
Match List - I with List - II
Choose the correct answer from the options given below:
A thin metallic spherical shell contains a charge +10 μC on it. A point charge +2 μC is placed at the centre of the shell and another charge +5 μC is placed outside it as shown. The force on the charge +2 μC at the centre is:
The force between two electric charges is expressed by the equation:
F = (k q1 q2) / r2
Which of the following is a correct statement?
