Every day, we interact with numerous gadgets and devices that run on electricity. Behind the marvel of electrical devices lies the mysterious world of electric charges and fields, a topic of great importance in the realm of Physics. These charges, though invisible to the naked eye, govern many phenomena around us. Let’s dive deeper into the world of electric charges and fields with these MCQs to test and enhance our understanding.
1. What type of charge does an electron possess?
Answer:
Explanation:
An electron has a negative charge.
2. Two charges repel each other when:
Answer:
Explanation:
Like charges repel each other.
3. The electric field intensity at a point due to a positive charge is:
Answer:
Explanation:
Electric field intensity due to a positive charge is always directed away from the charge.
4. Which of the following is a scalar quantity?
Answer:
Explanation:
Charge is a scalar, whereas the electric field, force, and torque are vector quantities.
5. The SI unit of electric charge is:
Answer:
Explanation:
The standard unit of electric charge in the SI system is Coulomb.
6. If two charges are separated by a distance r in a vacuum, the force between them is given by:
Answer:
Explanation:
Coulomb’s law gives the force between two charges separated by a distance in a vacuum.
7. An electric dipole consists of:
Answer:
Explanation:
An electric dipole consists of two equal and opposite charges separated by a distance.
8. Equipotential surfaces are:
Answer:
Explanation:
Equipotential surfaces are always perpendicular to electric field lines.
9. The electric field due to a point charge is:
Answer:
Explanation:
The electric field due to a point charge decreases with the square of the distance from the charge.
10. The work done in moving a charge on an equipotential surface is:
Answer:
Explanation:
Since there is no potential difference on an equipotential surface, no work is done in moving a charge on it.
11. What term describes the force experienced by a unit charge due to an external field?
Answer:
Explanation:
The electric field is defined as the force experienced by a unit positive charge due to its presence in the vicinity of another charge.
12. What value is the dielectric constant for metals?
Answer:
Explanation:
Metals possess an infinite dielectric constant because the effective electric field within them is zero.