PHY101 Final Term Preparation

PHY101 FINAL TERM · PREPARATION 2025 · FOLLOW OUR · WHASTAPP CHANNEL · FOR CURRENT PAPERS · AND MORE UPDATES · Lecture 23

Q1. From a mathematical perspective, what is the primary difference between calculating electric fields for point charges versus continuous charge distributions?

1. Point charges require vector addition while continuous distributions need scalar addition
2. Point charges use summation while continuous distributions
3. Point charges use multiplication while continuous distributions

use division

d) There is no mathematical difference

Answer: b) Point charges use summation while continuous distributions

Q2. From a dimensional analysis viewpoint, which statement about charge density is correct?

1. Linear charge density (λ) has units of C/m
2. Surface charge density (σ) has units of C/m³
3. Volume charge density (ρ) has units of C/m
4. All charge densities have the same units

Answer: a) Linear charge density (λ) has units of C/m

Q3. From an experimental physicist's perspective, what happens to the electric field of a charged ring at very large distances?

1. It becomes zero
2. It becomes infinite
3. It behaves like a point charge
4. It remains unchanged

Answer: c) It behaves like a point charge

Q4. From a theoretical physics viewpoint, what is the fundamental principle behind Gauss's Law?

1. Conservation of energy
2. Conservation of charge
3. The relationship between electric flux and enclosed charge
4. Conservation of momentum

Answer: c) The relationship between electric flux and enclosed charge

Q5. From an engineering perspective, what is the key advantage of using Gauss's Law over Coulomb's Law?

1. It works for any shape of closed surface
2. It only works for spherical surfaces
3. It requires less mathematical computation
4. It gives more accurate results

Answer: a) It works for any shape of closed surface

Q6. From a field theory perspective, what is the significance of the electric flux through a closed surface?

1. It represents the total work done by the field
2. It measures the total charge enclosed within the surface
3. It indicates the strength of magnetic field
4. It shows the potential difference

Answer: b) It measures the total charge enclosed within the surface

Q7. From a problem-solving viewpoint, what happens to the electric field inside a hollow charged sphere?

1. It equals zero
2. It equals the surface charge density
3. It varies linearly with radius
4. It follows inverse square law

Answer: a) It equals zero

Q8. From an analytical perspective, what is the key characteristic of electric field lines at a distance r from a uniformly charged infinite wire?

1. They are parallel to the wire
2. They are perpendicular to the wire
3. They form circular loops around the wire
4. They are random in direction

Answer: b) They are perpendicular to the wire