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1. What do you mean by the magnetic effect of current?
When a current flows in a conductor, a magnetic field is produced around it, this is called magnetic effect of current.
2. What is the nature of the material of the circular coil?
The coil is made up of an insulated copper wire wound on a circular frame of non-magnetic material.
3. What is the direction of field at a point on the axis of the coil?
The direction of the field is along the axis of the coil.
4. What is the direction of magnetic field at centre of the coil?
The direction of magnetic field at centre of the coil is normal to the plane of the coil. If the current in the face of the coil facing the observer flows in the clockwise direction then that face attains south polarity and direction of the field will be directed away from the observer. Conversely, if the current flows in the anticlockwise direction in the face facing the observer, then the field will be directed towards the observer.
5. What is the practical utility of finding the variation magnetic field along the axis of a circular coil?
The study of variation of magnetic field revels the existence of two points of inflection at which the rate of change of magnetic field with distance constant. This property has been used in the construction of Helmholtz galvanometer.
6. What is Helmholtz galvanometer?
Helmholtz galvanometer is the modified form of a tangent galvanometer in which two identical vertical flat circular coils placed co-axially at a distance equal to the radius of the either coil. Near the point on the common axis mid-way between them the magnetic compass box placed mid-way between the two coils rotates in uniform fields . Due to this reason, a Helmholtz galvanometer is more sensitive that tangent galvanometer.
7. What are the advantages of a Helmholtz galvanometer over on ordinary tangent galvanometer?
Helmholtz galvanometer is superior than tangent galvanometer due to following reasons :
- In the ordinary tangent galvanometer the field is uniform only at the centre of the coil, while in Helmholtz galvanometer the resultant field in the entire region between the two coils is almost uniform.
- For the coil of same radius and for the same number of turns, the reduction factor of Helmholtz galvanometer is less than that of tangent galvanometer. Hence, the sensitivity of Helmholtz galvanometer is more than that of the tangent galvanometer.
- For the same current, Helmholtz galvanometer produces greater resultant field and hence greater deflection.
- Therefore Helmholtz galvanometer is superior, more sensitive and accurate than tangent galvanometer.
8. Why Helmholtz galvanometer is more accurate than tangent galvanometer?
Because due to wide region of uniform magnetic field, tangent law is more strictly followed in Helmholtz galvanometer than in tangent galvanometer.
9. What is Magnetic Meridian?
The vertical plane passing through the axis of a freely suspended magnet is called magnetic meridian.
10. What is the use of commutator in experiment?
Commutator is used to reverse the direction of current in an electric circuit.
11. Why the Stewart Gee type galvanometer is called tangent galvanometer?
It is called tangent galvanometer because the working of this galvanometer is based upon tangent law.
12. What is the distance between two points of inflection?
The distance between the two point of inflection is equal to the radius of the circular coil.
Today we share all the details about viva questions on variation of magnetic field. If you still has any question regarding it do comment below.
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