Magnetic Lines of Force — Homi Bhabha Class 9 Physics MCQs with Solutions
Free Homi Bhabha Class 9 Physics Magnetic Lines of Force MCQs with step-by-step solutions (6 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.
Q5 — Magnetic Lines of Force · easy · theory
Outside a bar magnet, the magnetic field lines are directed:
A. in no particular direction
B. from the north pole to another north pole
C. from the north pole to the south pole ✓ Correct
D. from the south pole to the north pole
Solution: Outside a magnet the field lines run from the north pole to the south pole; inside the magnet they run from south to north, forming closed loops.
Q6 — Magnetic Lines of Force · medium · theory
Two magnetic field lines can never cross each other because:
A. field lines carry electric current
B. field lines are always straight
C. at the crossing point the field would have two directions, which is impossible ✓ Correct
D. field lines exist only inside the magnet
Solution: A field line shows the direction of the magnetic field at each point. If two lines crossed, the field would point in two different directions at that single point, which cannot happen.