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12th Standard English Medium Physics Subject Magnetism and Magnetic Effects of Electric Current Book Back 1 Mark Questions with Solution Part - II

12th Standard

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Physics

Time : 00:30:00 Hrs
Total Marks : 5

    Part I

    5 x 1 = 5
  1. Two identical coils, each with N turns and radius R are placed coaxially at a distance R as shown in the figure. If I is the current passing through the loops in the same direction, then the magnetic field at a point P at a distance of R/2 from the centre of each coil is _____.
     

    (a)

    \(\frac { 8N{ \mu }_{ ° }I }{ \sqrt { 5 } R } \)

    (b)

    \(\frac { 8N{ \mu }_{ ° }I }{ { 5 }^{ 3/2 }R } \)

    (c)

    \(\frac { 8N{ \mu }_{ ° }I }{ { 5 }R } \)

    (d)

    \(\frac { 4N{ \mu }_{ ° }I }{ \sqrt { 5 } R } \)

  2. A bar magnet of length l and magnetic moment pm is bent in the form of an arc as shown in Figure. The new magnetic dipole moment will be

    (a)

    pm

    (b)

    \(\frac{3}{\pi} p_{m}\)

    (c)

    \(\frac{2}{\pi} p_{m}\)

    (d)

    \(\frac{1}{2} p_{m}\)

  3. The BH curve for a ferromagnetic material is shown in the figure. The material is placed inside a long solenoid which contains 1000 turns/cm. The current that should be passed in the solenoid to demagnetize the ferromagnet completely is _____.

    (a)

    1.00 m A

    (b)

    1.25 mA

    (c)

    1.50 mA

    (d)

    1.75 mA

  4. The vertical component of Earth’s magnetic field at a place is equal to the horizontal component. What is the value of angle of dip at this place?

    (a)

    30° 

    (b)

    45° 

    (c)

    60° 

    (d)

    90° 

  5. A simple pendulum with charged bob is oscillating with time period T and lets θ be the angular displacement. If the uniform magnetic field switched ON in a direction perpendicular to the plane of oscillation then ___________.

    (a)

    time period will decrease but θ will remain constant

    (b)

    time period remain constant but θ will decrease

    (c)

    both T and θ will remain the same

    (d)

    both T and θ will decrease

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