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Magnetic Effects of Current and Magnetism

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

Moving Charges and Magnetic Field (Biot-Savart & Ampere's Law)

Subtopic

Moving Charges and Magnetic Field (Biot-Savart & Ampere's Law) under Magnetic Effects of Current and Magnetism for Grade 12 ICSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    The magnetic field at the center of a circular loop of radius RR carrying current II is given by the expression:

    A.

    B=μ0I2πRB = \frac{\mu_0 I}{2\pi R}

    B.

    B=μ0I4πRB = \frac{\mu_0 I}{4\pi R}

    C.

    B=μ0I2RB = \frac{\mu_0 I}{2R}

    D.

    B=μ0IRB = \frac{\mu_0 I}{R}

  2. 2.

    A long straight wire carries a current flowing vertically upwards. What is the direction of the magnetic field at a point directly to the east of the wire?

    A.

    Towards North

    B.

    Towards South

    C.

    Towards West

    D.

    Vertically Downwards

  3. 3.

    What is the SI unit of magnetic field induction (magnetic flux density)?

    A.

    Weber (WbWb)

    B.

    Henry (HH)

    C.

    Tesla (TT)

    D.

    Farad (FF)

Download the worksheet for Magnetic Effects of Current and Magnetism - Moving Charges and Magnetic Field (Biot-Savart & Ampere's Law) to practice offline. It includes additional chapter-level practice questions.

Torque on a Current Loop and Galvanometers

Subtopic

Torque on a Current Loop and Galvanometers under Magnetic Effects of Current and Magnetism for Grade 12 ICSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    To convert a moving coil galvanometer into an ammeter, which of the following modifications is required?

    A.

    Connecting a high resistance in series

    B.

    Connecting a high resistance in parallel

    C.

    Connecting a low resistance in parallel

    D.

    Connecting a low resistance in series

  2. 2.

    In a moving coil galvanometer, the magnetic field is made radial by using concave pole pieces and a soft iron core. This is done to ensure that:

    A.

    The torque is independent of the orientation of the coil (sinθ=1sin \theta = 1)

    B.

    The magnetic field is as weak as possible

    C.

    The galvanometer can measure alternating current

    D.

    The resistance of the coil is minimized

  3. 3.

    The torque acting on a magnetic dipole of moment m⃗\vec{m} placed in a uniform magnetic field B⃗\vec{B} is given by the expression:

    A.

    τ⃗=m⃗⋅B⃗\vec{\tau} = \vec{m} \cdot \vec{B}

    B.

    τ⃗=B⃗×m⃗\vec{\tau} = \vec{B} \times \vec{m}

    C.

    τ⃗=m⃗×B⃗\vec{\tau} = \vec{m} \times \vec{B}

    D.

    τ⃗=mBcos⁡θ\vec{\tau} = mB \cos \theta

Download the worksheet for Magnetic Effects of Current and Magnetism - Torque on a Current Loop and Galvanometers to practice offline. It includes additional chapter-level practice questions.

Magnetism and Matter (Earth’s Magnetic Field)

Subtopic

Magnetism and Matter (Earth’s Magnetic Field) under Magnetic Effects of Current and Magnetism for Grade 12 ICSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    The value of the angle of dip at the Earth's magnetic poles is:

    A.

    0∘0^{\circ}

    B.

    45∘45^{\circ}

    C.

    180∘180^{\circ}

    D.

    90∘90^{\circ}

  2. 2.

    Which of the following equations correctly represents the relationship between the total magnetic field BB, its horizontal component BHB_H, and the angle of dip θ\theta?

    A.

    BH=Bcos⁡θB_H = B \cos \theta

    B.

    BH=Bsin⁡θB_H = B \sin \theta

    C.

    B=BHtan⁡θB = B_H \tan \theta

    D.

    B=BH/sin⁡θB = B_H / \sin \theta

  3. 3.

    At the magnetic equator of the Earth, a magnetic needle that is free to rotate in a vertical plane (a dip needle) will remain:

    A.

    Vertical

    B.

    At an angle of 45∘45^{\circ} to the horizontal

    C.

    Horizontal

    D.

    At an angle of 60∘60^{\circ} to the horizontal

Download the worksheet for Magnetic Effects of Current and Magnetism - Magnetism and Matter (Earth’s Magnetic Field) to practice offline. It includes additional chapter-level practice questions.

Magnetic Properties of Materials (Dia, Para, Ferro)

Subtopic

Magnetic Properties of Materials (Dia, Para, Ferro) under Magnetic Effects of Current and Magnetism for Grade 12 ICSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    A material that exhibits perfect diamagnetism, completely expelling magnetic flux lines from its interior, is known as a:

    A.

    Ferromagnet

    B.

    Paramagnet

    C.

    Superconductor

    D.

    Ferrimagnet

  2. 2.

    According to Curie's Law, the magnetic susceptibility (χ)(\chi) of a paramagnetic material varies with the absolute temperature (T)(T) as:

    A.

    χ∝1/T\chi \propto 1/T

    B.

    χ∝T\chi \propto T

    C.

    χ∝T2\chi \propto T^2

    D.

    χ\chi is independent of TT

  3. 3.

    When a paramagnetic substance is placed in a non-uniform magnetic field, it tends to move from:

    A.

    Weaker to stronger parts of the magnetic field

    B.

    Stronger to weaker parts of the magnetic field

    C.

    A region of zero field to a region of maximum field only

    D.

    It remains stationary regardless of the field gradient

Download the worksheet for Magnetic Effects of Current and Magnetism - Magnetic Properties of Materials (Dia, Para, Ferro) to practice offline. It includes additional chapter-level practice questions.

Magnetic Effects of Current and Magnetism - Class 12 Physics (ICSE) | Krit.club