Question

On what factors does the field produced by the current passing through the wire depend? (i) Why do magnetic field lines never intersect each other? (ii) State the rule used to determine the direction of a magnetic field around a wire carrying current.

Answer 1

Explanation:

Cureent depends on length of wire, its cross section area and its resistivity.

i) as the direction of compass neddle shows the direction of magnetic field(i.e it shows the north and south pole) the inter section of two lines would mean that there are two north pole(where the magnetic field lines end) and south pole(where they erupt) and hence compass will show two north and south pole which is impossible.

ii) Right hand thumb rule states that: Curl ur hand in such a way that it looks like you are holding a wire in your hand pointing the thumb perpendicularly, if the thumb shows the direction of current then the curl fingers shows the direction of magnetic field.