Equal amount of charge is given to two sphere A and B radii 2cm and 3cm respectively. The potential VA and VB
Correct answer: B. VA>VB
- A. VA=VB
- B. VA>VB
- C. VA<VB
- D. Depends upon the material of the sphere
Explanation
For spheres with the same charge, the electric potential V at the surface is given by V = kq/r, where Q is the charge, R is the radius, and k is Coulomb's constant. Since both spheres have the same charge, the potential is inversely proportional to the radius. Sphere A, with a radius of 2cm, will have a higher potential than sphere B, with a radius of 3cm. Therefore, VA > VB. Option A is incorrect because it assumes the same potential for different radii. Option C is incorrect because it suggests a lower potential for a smaller radius. Option D is incorrect as the potential does not depend on the material for this context.
Last updated
About Electrostatics
Electrostatics describes forces between charges through Coulomb's law, electric fields and field intensity, then uses electric potential to measure energy per unit charge. Capacitors store charge and electrical energy, with capacitance depending on geometry and dielectric material, not simply on the amount of charge present.
Practise Electrostatics
831 free Electrostatics MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Physics questions like this
Physics is on 13 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
1/C_eq = 1/C_1 + 1/C_2 + 1/C_3 + ... + 1/C_n
1 N/C equals to:
1 volt x 1 ampere is equal to:
10 V potential difference is applied across the plate of the 1 µF capacitor. What is the energy stored in the capacitor?
12 J work is to be done against an existing electric field to take a charge of 0.01C from A to B. Find the potential difference between B and A: