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Electric Charges and Fields

Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.

Coulomb’s Law

Subtopic

Coulomb’s Law under Electric Charges and Fields for Grade 12 CBSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    Which of the following statements correctly describes the nature of the electrostatic force between two point charges?

    A.

    It is always attractive in nature

    B.

    It is a non-conservative force

    C.

    It acts along the line joining the centers of the two charges

    D.

    It depends on the velocity of the charges

  2. 2.

    Two point charges are placed in a vacuum and exert a force FF on each other. If a dielectric slab of dielectric constant K=5K = 5 is inserted between them, what will be the new electrostatic force?

    A.

    F/5F/5

    B.

    5F5F

    C.

    F/25F/25

    D.

    FF

  3. 3.

    What is the SI unit of the absolute permittivity of free space (epsilon0\\epsilon_0)?

    A.

    Nm2C−2N m^2 C^{-2}

    B.

    C2N−1m−2C^2 N^{-1} m^{-2}

    C.

    C2Nm2C^2 N m^2

    D.

    N−1m−2C−1N^{-1} m^{-2} C^{-1}

Download the worksheet for Electric Charges and Fields - Coulomb’s Law to practice offline. It includes additional chapter-level practice questions.

Electric Field and Field Lines

Subtopic

Electric Field and Field Lines under Electric Charges and Fields for Grade 12 CBSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    A test charge qq experiences an electrostatic force FF when placed in an external electric field EE. The mathematical relationship is given by:

    A.

    F=qEF = qE

    B.

    F=q/EF = q/E

    C.

    F=E/qF = E/q

    D.

    F=q2EF = q^2E

  2. 2.

    Which of the following statements is FALSE regarding electrostatic field lines?

    A.

    Field lines originate from positive charges and terminate at negative charges.

    B.

    Electrostatic field lines form closed loops.

    C.

    Two field lines can never cross each other at any point.

    D.

    Field lines are continuous curves in a charge-free region.

  3. 3.

    The electric field lines due to an isolated single negative point charge are directed:

    A.

    Radially outward

    B.

    Radially inward

    C.

    In clockwise circles

    D.

    In anti-clockwise circles

Download the worksheet for Electric Charges and Fields - Electric Field and Field Lines to practice offline. It includes additional chapter-level practice questions.

Electric Flux

Subtopic

Electric Flux under Electric Charges and Fields for Grade 12 CBSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    A point charge +q+q is placed at the center of a closed hemispherical bowl. What is the electric flux through the curved surface of the bowl?

    A.

    q/ϵ0q/\epsilon_0

    B.

    Zero

    C.

    q/2ϵ0q/2\epsilon_0

    D.

    2q/ϵ02q/\epsilon_0

  2. 2.

    According to Gauss's Law, the net electric flux through any closed surface is proportional to:

    A.

    The net charge enclosed by the surface

    B.

    The square of the distance from the charge

    C.

    The surface area of the enclosure

    D.

    The intensity of the external electric field

  3. 3.

    If the radius of a Gaussian spherical surface enclosing a point charge is tripled, how does the total electric flux through the surface change?

    A.

    It becomes nine times the original value

    B.

    It becomes three times the original value

    C.

    It remains unchanged

    D.

    It decreases to one-third of the original value

Download the worksheet for Electric Charges and Fields - Electric Flux to practice offline. It includes additional chapter-level practice questions.

Gauss’s Theorem and its Applications

Subtopic

Gauss’s Theorem and its Applications under Electric Charges and Fields for Grade 12 CBSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    A point charge qq is placed at the center of a cube of side LL. The electric flux through one of its faces is:

    A.

    q/ϵ0q / \epsilon_0

    B.

    q/(L2ϵ0)q / (L^2 \epsilon_0)

    C.

    q/(4ϵ0)q / (4\epsilon_0)

    D.

    q/(6ϵ0)q / (6\epsilon_0)

  2. 2.

    The electric field intensity EE due to an infinitely long straight 1D wire with uniform linear charge density λ\lambda varies with distance rr from the wire as:

    A.

    E∝rE \propto r

    B.

    E∝1/rE \propto 1/r

    C.

    E∝1/r2E \propto 1/r^2

    D.

    E∝1/r3E \propto 1/r^3

  3. 3.

    According to Gauss’s Law, the total electric flux through a closed surface depends only on:

    A.

    The shape of the closed surface

    B.

    The size of the closed surface

    C.

    The net charge enclosed by the surface

    D.

    The location of the charges within the surface

Download the worksheet for Electric Charges and Fields - Gauss’s Theorem and its Applications to practice offline. It includes additional chapter-level practice questions.

Electric Charges and Fields - Class 12 Physics (CBSE) | Krit.club