krit.club logo

Moving Charges and Magnetism

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

Biot-Savart Law

Subtopic

Biot-Savart Law under Moving Charges and Magnetism for Grade 12 CBSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    The direction of the magnetic field dB⃗d\vec{B} produced by a current element Idl⃗I d\vec{l} at a position vector r⃗\vec{r} is given by the direction of:

    A.

    dl⃗⋅r⃗d\vec{l} \cdot \vec{r}

    B.

    r⃗×dl⃗\vec{r} \times d\vec{l}

    C.

    dl⃗+r⃗d\vec{l} + \vec{r}

    D.

    dl⃗×r⃗d\vec{l} \times \vec{r}

  2. 2.

    A straight wire carries a current II along the positive z-axis. What is the magnitude of the magnetic field at a point located on the z-axis itself?

    A.

    μ0I2π\frac{\mu_0 I}{2\pi}

    B.

    μ0I4π\frac{\mu_0 I}{4\pi}

    C.

    Zero

    D.

    Infinite

  3. 3.

    What is the SI unit of the magnetic permeability of free space (μ0\mu_0)?

    A.

    T m A−1T\ m\ A^{-1}

    B.

    T m2 A−1T\ m^2\ A^{-1}

    C.

    T A m−1T\ A\ m^{-1}

    D.

    Wb m A−1Wb\ m\ A^{-1}

Download the worksheet for Moving Charges and Magnetism - Biot-Savart Law to practice offline. It includes additional chapter-level practice questions.

Ampere’s Circuital Law

Subtopic

Ampere’s Circuital Law under Moving Charges and Magnetism for Grade 12 CBSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    What is the SI unit of the line integral ∮B⋅dl\oint \mathbf{B} \cdot d\mathbf{l}?

    A.

    Tesla per meter (T/mT/m)

    B.

    Weber (WbWb)

    C.

    Tesla-meter (T⋅mT \cdot m)

    D.

    Ampere-meter (A⋅mA \cdot m)

  2. 2.

    The magnetic field inside an ideal solenoid is:

    A.

    Zero at all points

    B.

    Uniform and parallel to the axis of the solenoid

    C.

    Non-uniform and circular around the axis

    D.

    Varying linearly from the center to the edges

  3. 3.

    A long straight wire carries a steady current II. What is the value of the magnetic field at any point on the axis of the wire?

    A.

    Maximum

    B.

    Infinite

    C.

    Zero

    D.

    μ0I2π\frac{\mu_0 I}{2\pi}

Download the worksheet for Moving Charges and Magnetism - Ampere’s Circuital Law to practice offline. It includes additional chapter-level practice questions.

Force on a Moving Charge in Magnetic Field

Subtopic

Force on a Moving Charge in Magnetic Field under Moving Charges and Magnetism for Grade 12 CBSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    A proton is moving along the positive X-axis in a region where a uniform magnetic field is directed along the positive Y-axis. In which direction does the magnetic force act on the proton?

    A.

    Along the positive Z-axis

    B.

    Along the negative Z-axis

    C.

    Along the positive X-axis

    D.

    Along the negative Y-axis

  2. 2.

    A proton enters a uniform magnetic field at an angle of 90∘90^\circ to the field lines. What is the shape of the trajectory followed by the proton?

    A.

    Straight line

    B.

    Circular

    C.

    Helical

    D.

    Parabolic

  3. 3.

    What is the work done by a magnetic force on a single charged particle moving in a uniform magnetic field?

    A.

    It is always positive.

    B.

    It is always zero because the force is always perpendicular to the displacement.

    C.

    It is always negative.

    D.

    It depends on the magnitude of the charge.

Download the worksheet for Moving Charges and Magnetism - Force on a Moving Charge in Magnetic Field to practice offline. It includes additional chapter-level practice questions.

Moving Coil Galvanometer

Subtopic

Moving Coil Galvanometer under Moving Charges and Magnetism for Grade 12 CBSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    What is the function of the phosphor-bronze strip or the fine spring in a moving coil galvanometer?

    A.

    To increase the magnetic field strength

    B.

    To conduct current without any resistance

    C.

    To provide a restoring torque proportional to the angle of twist

    D.

    To reduce the damping of the coil

  2. 2.

    The current sensitivity of a moving coil galvanometer is given by the expression:

    A.

    kNAB\frac{k}{NAB}

    B.

    NABk\frac{NAB}{k}

    C.

    NBAk\frac{NB}{Ak}

    D.

    NAkB\frac{NAk}{B}

  3. 3.

    In a moving coil galvanometer, why are the pole pieces of the magnet made cylindrical (concave) and a soft iron core placed inside the coil?

    A.

    To decrease the sensitivity of the galvanometer

    B.

    To make the magnetic field radial and maximize the torque

    C.

    To provide a restoring torque to the coil

    D.

    To reduce the weight of the instrument

Download the worksheet for Moving Charges and Magnetism - Moving Coil Galvanometer to practice offline. It includes additional chapter-level practice questions.

Moving Charges and Magnetism - Class 12 Physics (CBSE) | Krit.club