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Which instrument can be used to give the direction of magnetic field lines at any given point?
Solenoid
Generator
Magnetic compass
Electric motor
Magnetic compass
A magnetic compass is an instrument used to determine the direction of magnetic field lines at any given point. The north-seeking pole (needle) of a compass points along the tangent to the magnetic field line at that point.
A magnetic compass is an instrument used to determine the direction of magnetic field lines at any given point. The north-seeking pole (needle) of a compass points along the tangent to the magnetic field line at that point.
Just as a weather vane points in the direction the wind is blowing at a particular spot, a magnetic compass points in the direction of the magnetic field vector at that spot.
COMPASS points to the magnetic North, showing the Field's path forth.
B — Magnetic field vector
τ=m×B — Torque acting on a magnetic needle in a magnetic field
A magnetic compass contains a small, lightweight magnetized needle pivoted on a low-friction bearing. When placed in a magnetic field, the magnetic torque aligns the magnetic dipole moment of the needle with the local magnetic field vector, thereby showing the direction of the magnetic field lines.
A magnetic compass consists of a tiny pivoted magnet enclosed in a glass case.
The North pole of the compass needle points in the direction of the magnetic field vector.
Magnetic field lines are continuous closed curves originating from the North pole and ending at the South pole outside the magnet.
Two magnetic field lines never intersect each other.
Portable and requires no electrical power source.
Directly visualizes local direction of magnetic induction.
Affected by external ferromagnetic materials and stray magnetic fields.
Does not give the magnitude of the field directly, only direction.
Navigation and orientation (marine and terrestrial).
Mapping magnetic field lines around bar magnets and current-carrying conductors in physics laboratories.
Option A (Solenoid) is a coil of wire wound into a tightly packed helix used to create a uniform magnetic field.
Option B (Generator) is a device that converts mechanical energy into electrical energy using electromagnetic induction.
Option D (Electric motor) converts electrical energy into mechanical energy.
C is correct — Magnetic compass can be used to give the direction of magnetic field lines at any given point.
Remember that the tangent drawn at any point on a magnetic field line gives the direction of the magnetic force on a north pole placed at that point.
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