Magnetic Lines of Force — Homi Bhabha Exam Physics MCQs with Solutions
Free Homi Bhabha Exam Physics Magnetic Lines of Force MCQs with step-by-step solutions (4 questions). Part of Electricity & Magnetism. Practise online on Prepizo — no login needed.
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Questions with solutions
Q1 — Magnetic Lines of Force · medium · theory
Outside a bar magnet, the magnetic field lines are directed from the:
A. north pole to the north pole
B. south pole to the north pole
C. north pole to the south pole ✓ Correct
D. centre to the poles
Solution: By convention, field lines emerge from the north pole and enter the south pole outside the magnet.
Q2 — Magnetic Lines of Force · hard · theory
Two magnetic field lines can never intersect each other because:
A. field lines are straight
B. at the point of intersection there would be two directions of the field, which is impossible ✓ Correct
C. they repel each other
D. the field is zero there
Solution: A single point can have only one net field direction, so field lines cannot cross.
Q3 — Magnetic Lines of Force · medium · theory
The magnetic field is strongest where the field lines are:
A. farthest apart
B. straight
C. parallel
D. closest together (most crowded) ✓ Correct
Solution: The density of field lines indicates field strength; crowded lines mean a stronger field.
Q4 — Magnetic Lines of Force · medium · theory
A small compass needle placed in a magnetic field comes to rest:
A. in a random direction
B. along the direction of the field ✓ Correct
C. perpendicular to the field
D. pointing vertically down
Solution: The compass needle aligns itself along the local direction of the magnetic field.