UHS Punjab MDCAT Physics: Electrostatics MCQs

UHS Punjab MDCAT Physics: Electrostatics MCQs — sample questions

1. Question 1

   Q1. The unit of electric field intensity in SI system is

   • A) N/C
   • B) V/m
   • C) J/C
   • D) C/N

   Answer: N/C

   Explanation: Electric field intensity is measured in N/C; V/m is equivalent but not the primary unit. C/N is incorrect.

2. Question 2

   Q2. Coulomb's law is applicable to

   • A) Point charges
   • B) Large spheres
   • C) Charged plates
   • D) Current carrying wires

   Answer: Point charges

   Explanation: Coulomb's law applies to point charges; it can be extended to larger objects with certain assumptions.

3. Question 3

   Q3. The electric potential at a point due to a point charge is given by

   • A) kQ/r
   • B) kQ/r^2
   • C) kQr
   • D) kQ/r^3

   Answer: kQ/r

   Explanation: Electric potential due to a point charge is kQ/r; kQ/r^2 is the electric field, not potential.

4. Question 4

   Q4. The capacitance of a capacitor depends upon

   • A) Charge on plates
   • B) Potential difference between plates
   • C) Geometry of capacitor
   • D) Dielectric material

   Answer: Geometry of capacitor

   Explanation: Capacitance depends on geometry; charge and potential difference are related but not the primary factors.

5. Question 5

   Q5. A capacitor is charged by a battery. The battery is removed and a dielectric slab is inserted. What happens to the charge?

   • A) Increases
   • B) Decreases
   • C) Remains the same
   • D) Becomes zero

   Answer: Remains the same

   Explanation: Charge remains the same as battery is removed; dielectric affects capacitance and potential difference.