Question

Viva questions and answers on variation of magnetic field with distance along axis of a circular coil carrying current

Answer 1

study the variation of magnetic field along the axis of a circular coil carrying current. APPARATUS: -Stewart and Gees, Rheostat, ...

Answer 2

1. Name the law to derive magnitude of magnetic field along axis of a circular coil carrying current.

answer : Biot - Savart law .

2. what is the relation between current, elementary length of conductor, sine of angle between element and the line joining the element to the observation point.

answer : $B=\frac{\mu_0idlsin\theta}{4\pi r^2}$

3. in question (2), what is the meaning of $\mu_0$ and what is the value of it ?

answer : it is a proportionality constant known as permeability of medium. permeability is the measure of the ability of a material to support the formation of a magnetic field within itself. value of $\mu_0$ =4π × 10^-7 N/A².

4. derived formula of magnetic field strength is similar formula of electric field strength ?

answer : yes of course, both are similar. both are inversely proportional to r². yes it's true for magnetic field, r means line joining element to observation point while for electric field , r means seperation between charges.