Advertisements
Advertisements
प्रश्न
Why does a magnetic compass needle pointing North and South in the absence of a nearby magnet get deflected when a bar magnet or a current carrying loop is brought near it. Describe some salient features of magnetic lines of field concept.
उत्तर
In the absence of an external magnetic field, only Earth’s magnetic field acts due to which magnetic compass needle points north and south direction.
Current carrying loops behave like bar magnets and both have their associated lines of field. This modifies the already existing earth’s magnetic field and a deflection results.
The salient features of magnetic field lines are:
- Magnetic lines form closed and continuous curve.
- Magnetic lines emerge from north-pole to south-pole outside the magnet.
- Magnetic field lines never intersect each other.
- Closer magnetic lines represent a stronger magnetic field and vice-versa.
APPEARS IN
संबंधित प्रश्न
A wire, bent into a circle, carries current in an anticlockwise direction. What polarity does this face of the coil exhibit?
What is a solenoid? Compare the magnetic field produced by a solenoid with the magnetic field of a bar magnet. Draw neat figures and name various components.
Answer the following question.
Explain with the help of the pattern of magnetic field lines the distribution of the magnetic field due to a current-carrying a circular loop.
State and illustrate the rule used for finding the polarity of the faces of a circular coil.
An induced emf is produced when a magnet is moved into a coil. The magnitude of induced emf does not depend on ____________.
The nature of magnetic field line passing through the centre of current carrying circular loop is ____________.
Meena draws magnetic field lines of field close to the axis of a current carrying circular loop. As she moves away from the centre of the circular loop she observes that the lines keep on diverging.
How will you explain her observation.
Explain with the help of a labelled diagram the distribution of magnetic field due to a current through a circular loop. Why is it that if a current carrying coil has n turns the field produced at any point is n times as large as that produced by a single turn?
Explain the phenomenon of electromagnetic induction. Describe an experiment to show that a current is set up in a closed loop when an external magnetic field passing through the loop increases or decreases.
The correct pattern of magnetic field lines of the field produced by a current carrying circular loop is:
