JAMB Physics questions: Electrostatics

13 questions with answers and explanations. Tap an option to check yourself.

1. Question 1· Electrostatics· JAMB

   On a charged conductor, charge collects mainly

   • Aon the outer surface, especially at sharp points
   • Bat its centre
   • Cin its inner core
   • Dnowhere

   Show answer

   Explanation and discussion

2. Question 2· Electrostatics· JAMB

   Two charges of 2 μC each are 0.3 m apart. Find the force between them. (k = 9 × 10⁹ N m²/C²)

   • A1.2 × 10⁻⁵ N
   • B0.12 N
   • C4 N
   • D0.4 N

   Show answer

   Explanation and discussion

3. Question 3· Electrostatics· JAMB

   When a plastic rod is rubbed with a cloth, it becomes charged because

   • Aneutrons are removed
   • Bprotons move into the rod
   • Cthe rod is heated
   • Delectrons are transferred between the rod and the cloth

   Show answer

   Explanation and discussion

4. Question 4· Electrostatics· JAMB

   A lightning conductor protects a building by

   • Astoring charge
   • Bdischarging charge through its sharp points to earth
   • Cattracting rain
   • Dinsulating the building

   Show answer

   Explanation and discussion

5. Question 5· Electrostatics· JAMB

   Electric field lines point from

   • Anegative charges to positive charges
   • Bpositive charges to negative charges
   • Cnorth to south
   • Dearth to the charge always

   Show answer

   Explanation and discussion

6. Question 6· Electrostatics· JAMB

   When a conductor is charged by induction, the charge it finally acquires is

   • Azero
   • Bthe same as that of the inducing charge
   • Calways positive
   • Dopposite to that of the inducing charge

   Show answer

   Explanation and discussion

7. Question 7· Electrostatics· JAMB

   Two charges of like sign placed near each other will:

   • Aattract
   • Bneutralise
   • Crepel
   • Dnot interact

   Show answer

   Explanation and discussion

8. Question 8· Electrostatics· JAMB

   Two point charges attract with force F. If each charge is doubled and the distance between them is also doubled, the new force is

   • AF/4
   • B4F
   • CF
   • D2F

   Show answer

   Explanation and discussion

9. Question 9· Electrostatics· JAMB

   A positively charged rod is brought near the cap of a negatively charged electroscope. The leaf

   • Arises further
   • Bfalls (its divergence decreases)
   • Cstays unchanged
   • Dfalls and then rises at once

   Show answer

   Explanation and discussion

10. Question 10· Electrostatics· JAMB

    A lightning conductor works on the principle of

    • AOhm's law
    • Belectromagnetic induction
    • Cthe heating effect of current
    • Daction at sharp points

    Show answer

    Explanation and discussion

11. Question 11· Electrostatics· JAMB

    The SI unit of electric field intensity is

    • Avolt
    • Bcoulomb per newton
    • Cnewton per coulomb
    • Dfarad

    Show answer

    Explanation and discussion

12. Question 12· Electrostatics· JAMB

    One volt is equal to one

    • Acoulomb per second
    • Bjoule per coulomb
    • Cjoule per second
    • Dnewton per coulomb second

    Show answer

    Explanation and discussion

13. Question 13· Electrostatics· JAMB

    Find the electric field strength 0.2 m from a point charge of 4 × 10⁻⁹ C. [k = 9 × 10⁹ N m²/C²]

    • A180 N/C
    • B900 N/C
    • C36 N/C
    • D9,000 N/C

    Show answer

    Explanation and discussion