Physics
The presence of a magnetic field at a point can be detected by means of a:
- a strong magnet
- a solenoid
- a compass needle
- a current carrying wire.
Electro-Magnetism
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Answer
a compass needle
Reason — The presence of magnetic field at a point can be detected by means of a compass needle.
A strong magnet can produce a magnetic field, it doesn't directly detect the presence of a magnetic field. Instead, it creates its own magnetic field.
A solenoid is essentially a coil of wire, which, when current flows through it, generates a magnetic field. It also doesn't directly detect the presence of an external magnetic field. It creates its own magnetic field.
In the presence of a magnetic field, the needle of compass rests only along the direction of magnetic field. Hence, it can be used to detect the presence of a magnetic field.
A current-carrying wire does generate a magnetic field, it doesn't directly detect the presence of an external magnetic field. It's used to create magnetic fields, not to detect them.
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Related Questions
In the figure given below, when the key is pressed, a current passes in the wire in the direction from A to B (i.e., from south to north). The north pole of the compass needle will deflect towards:
- East
- North
- South
- West
The strength of a magnetic field depends on :
- magnitude of current
- direction of current
- both (1) and (2)
- none of the above
In the figure given below, current is passed in a downward direction through a cardboard. The magnetic field lines would be :
- straight lines
- concentric circles
- elliptical lines
- squares
The point where two magnetic fields are equal but opposite in direction is called a:
- parallel point
- magnetic point
- pole point
- neutral point