HSSC-II (Class-12) Solved Physics MCQs; Unit-13: Electromagnetism (Baluchistan Textbook Board, Quetta) With Verified Answers   


1. The maximum force that acts on a current-carrying conductor placed in a magnetic field, when the angle between the field and the length of the conductor is




... Answer is C. 90°
Fₘ = kIlB sine θ and sin 90° = 1


2. Tesla in terms of base units is equal to




... Answer is D. kg s⁻² A⁻¹
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3. One Gauss is equal to




... Answer is C. 10⁻⁴ T
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4. The unit of magnetic flux is




... Answer is B. Weber
{1 Wb(Weber) = V s = kg m² s⁻² A⁻¹ }{1 T(Tesla) = N m⁻¹ A⁻¹ = kg m s⁻² A⁻¹ }{1 H(Henry) = Wb A⁻¹ = V s A⁻¹ = kg m² s⁻² A⁻²}


5.  The magnetic flux is maximum when the angle between the magnetic field and vector area is




... Answer is A. 0°
`\Ñ„_b` = BA cos θ and cos 0° = 1


6. Magnetic flux density is defined in terms of




... Answer is D. All of them
1 T = wb m⁻² = N m⁻¹ A⁻¹ = kg m s⁻² A⁻¹


7. A charged particle is moving along X-axis in a magnetic field along the Y-axis. The direction of the magnetic force acting on it is :




... Answer is C. along the z-axis
Fleming left-hand rule


8. Ampere's Law gives us the relationship between




... Answer is D. Current and magnetic field



9. The value of permeability of free space is




... Answer is C. 4Ï€ ｘ10⁻⁷ T m A⁻¹
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10. The magnetic field due to a current-carrying solenoid that has 'n' number of turns per unit length is




... Answer is A. A = μ₀ n `\I`
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11. The magnetic field inside the solenoid is independent of one of the following quantities




... Answer is C. Position vector
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12. What is the magnetic force on a stationary charged particle in a uniform magnetic field?




... Answer is A. Zero
F = q(vｘB), when v = 0 m/s thus F = 0


13. An electron is moving horizontally towards the east. If it enters in a magnetic field directed upward then the electron will be deflected in the direction of

... Answer is C. North
As the magnetic force is acting upwards, the electron will be reflected in an upward direction.


14.  When the direction of motion of a charged particle is perpendicular to the direction of the magnetic field, then the particle follows the path of a




... Answer is D. circle
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15. The torque due to a current-carrying rectangular coil placed in a uniform magnetic field is




... Answer is D. T = NAIB sin θ
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16.. The working principle of a galvanometer is based upon




... Answer is B. Torque
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17. The current passing through the coil of a galvanometer is directly proportional to the :




... Answer is C. Angle of deflection
I ∝ θ


18. A shunted galvanometer is called




... Answer is B. Ammeter



19. A galvanometer can be converted into a voltmeter by connecting it with




... Answer is D. High resistance in series



20. Which one of the following quantities is not measured by Avometer




... Answer is A. Charge







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