Physics- Electric Charges and Fields Online Practice Exams

Physics- Electric Charges and Fields

Free Mock Test

Questions 28
Maximum mark 28

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Physics- Electric Charges and Fields Online Practice Exams FAQs

1. What is the fundamental unit of electric charge?

The fundamental unit of electric charge is the elementary charge, denoted by "e." It has a magnitude of approximately 1.6 x 10^-19 coulombs (C). Protons carry a positive charge of +e, while electrons carry a negative charge of -e. Charges of other particles are quantized in integer multiples of this elementary charge.

2. What is Coulomb's law, and how does it describe the force between two charges?

Coulomb's law states that the force (F) between two point charges is directly proportional to the product of their magnitudes (q1 and q2) and inversely proportional to the square of the distance (r) between them. Mathematically, it is represented as: F = (k * |q1 * q2|) / r^2, where k is the electrostatic constant (approximately 8.99 x 10^9 N m^2/C^2). If both charges are of the same sign (either positive or negative), the force is repulsive. If the charges have opposite signs, the force is attractive.

3. What is an electric field, and how is it related to electric charges?

An electric field (E) is a region in space around an electric charge where a test charge would experience an electric force. It is a vector quantity and is defined as the force per unit positive charge. Mathematically, the electric field (E) at a point due to a point charge (q) is given by: E = (k * |q|) / r^2, where k is the electrostatic constant, |q| is the magnitude of the charge, and r is the distance from the charge to the point where the field is being calculated. Electric fields point away from positive charges and towards negative charges.

4. What is an electric dipole?

An electric dipole consists of two equal and opposite point charges separated by a small distance. The electric dipole moment (p) of the dipole is the product of the magnitude of either charge (q) and the distance (d) between them. Mathematically, it is represented as: p = q * d. Electric dipoles experience a torque when placed in an external electric field, aligning themselves with the field.

5. How is the electric field inside a charged conductor?

Inside a charged conductor, the electric field is zero. Any excess charge on a conductor resides on its surface, and the charges redistribute themselves to cancel out any electric field within the conductor. This redistribution of charges ensures that the net electric field inside the conductor is nullified.