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Which of the following statements about magnetic field is correct?
Its direction at any point is measured by a magnetic compass.
It is a scalar quantity.
It is always in the form of straight lines.
It only exists outside the magnet.
Its direction at any point is measured by a magnetic compass.
A magnetic field is a vector quantity that has both magnitude and direction. Its direction at any given point in space can be determined using a magnetic compass, which aligns itself along the tangent to the magnetic field line at that point.
A magnetic field is a vector quantity that has both magnitude and direction. Its direction at any given point in space can be determined using a magnetic compass, which aligns itself along the tangent to the magnetic field line at that point.
Just as a weather vane shows the direction in which the wind is blowing, a magnetic compass points in the direction of the magnetic field.
NC: North points to Compass direction of field lines.
B — Magnetic field vector
F=q(v×B) — Lorentz magnetic force
The north pole of a compass needle experiences a force in the direction of the magnetic field vector at that location. By observing the orientation of the compass needle, one can map out the direction of magnetic field lines from the North pole to the South pole outside a magnet.
Magnetic field is a vector quantity having both magnitude and direction.
Magnetic field lines form continuous closed loops, extending from North to South outside the magnet and South to North inside.
A magnetic compass needle aligns itself tangentially to the magnetic field lines at any given point.
Magnetic field lines never intersect each other.
Navigation using a magnetic compass
Electric motors and generators
Magnetic resonance imaging (MRI)
Option B is incorrect because magnetic field is a vector quantity, not a scalar.
Option C is incorrect because magnetic field lines are curved loops, not always straight lines.
Option D is incorrect because magnetic fields exist both outside and inside the magnet.
A is correct — Its direction at any point is measured by a magnetic compass.
Remember that magnetic field lines are continuous closed loops (unlike electric field lines which start on positive charges and end on negative charges), meaning magnetic monopoles do not exist.
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