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Electromagnetism

11 free MDCAT Physics MCQs on Electromagnetism (PM&DC syllabus), each with the answer, an explanation and the textbook line it comes from. Tap to check, no sign-up.

MDCAT (Pakistan)PhysicsPre-medical (Grade 12)11 questions

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  1. Question 1

    Hans Oersted first described the magnetic field due to current in a wire in:

    Show answer and explanation

    Answer: C) 1820

    Compass needles set along tangents to circles around the wire. Source: 11 Physics Book FBISE, p. 221.

  2. Question 2

    The magnetic field was studied as early as 1269 by:

    Show answer and explanation

    Answer: A) Petrus Peregrinus

    Coulomb confirmed Earth's magnetic field in 1785. Source: 11 Physics Book FBISE, p. 220.

  3. Question 3

    The permeability of free space has the value:

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    Answer: D) 4 pi x 10^-7 Wb/A m

    Used in B = mu0 I / 2 pi r. Source: 11 Physics Book FBISE, p. 231.

  4. Question 4

    A 2 m wire carrying 15 A makes an angle of 60 degrees with a uniform 0.50 T magnetic field. The magnetic force on it is about:

    Show answer and explanation

    Answer: B) 12.99 N

    F = ILB sin 60 = 15 x 2 x 0.5 x 0.866 = 12.99 N. Source: 11 Physics Book FBISE, p. 244.

  5. Question 5

    A horizontal power line carries 100 A. The magnetic field due to it at a point 2.0 m below the line is:

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    Answer: C) 1.0 x 10^-5 T

    B = mu0 I / 2 pi r = (4 pi x 10^-7 x 100)/(2 pi x 2) = 1.0 x 10^-5 T. Source: 11 Physics Book FBISE, p. 231.

  6. Question 6

    Unlike electric field lines, magnetic field lines always:

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    Answer: A) Form closed loops

    Outside a magnet they run from N to S; inside, from S to N. Source: 11 Physics Book FBISE, p. 221.

  7. Question 7

    Because magnetic field lines form complete loops, isolated north or south poles (magnetic monopoles):

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    Answer: B) Do not exist

    Poles always occur in pairs. Source: 11 Physics Book FBISE, p. 221.

  8. Question 8

    In Fleming's left-hand rule, with the forefinger along the field and the middle finger along the current, the thumb gives the direction of the:

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    Answer: B) Magnetic force

    The three fingers are held mutually perpendicular. Source: 11 Physics Book FBISE, p. 224.

  9. Question 9

    A charged particle that enters a uniform magnetic field at 60 degrees to it follows a:

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    Answer: D) Helical path

    Its velocity has components both along and across the field. Source: 11 Physics Book FBISE, p. 226.

  10. Question 10

    Placing a soft iron (ferrous) core inside a solenoid makes its magnetic field:

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    Answer: C) Increase significantly

    The core has very high relative permeability. Source: 11 Physics Book FBISE, p. 231.

  11. Question 11

    Two long parallel wires carrying currents in the same direction:

    Show answer and explanation

    Answer: D) Attract each other

    Currents in opposite directions repel. Source: 11 Physics Book FBISE, p. 232.

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