Question

Explain me this question in a simple way !! please.....
i don't get this....last time a guy answered to this question but i was not able
to understand . He said that - Magnetic field will be larger at Q because
the direction of magnetic field is outwards. what does he mean by it?

Answer 1

Answer:

Direction of magnetic field at point p wil be perpendicularly inward and at point Q it will be perpendicularly outward... while magnetic field at point Q is larger then at point p.

Explanation:

Simply for direction of magnetic field at point P and Q you can use right hand thumb rule....

Place your thumb in the direction of current and then curl your finger, so at point p you will see that you fingers will go inside the plane of paper so here at point p direction of magnetic field will be inward to the plane of paper or perpendicularly inward.....You can follow same procedure at point Q, there you will get direction of magnetic field as outward to the plane of paper or perpendicularly outward....

I am assuming that given wire in your question is infinite length wire....

So for infinite length current carrying wire formula of magnetic field is

B= (mu)oI/2πr......

where (mu)o is permeability of free space

I is current in wire

and r is distance of point from wire..

So as you see in above formula that mu, I and 2π are constant for both point it will not change for both point. Only the thing that will affect value of magnetic field is r (since both points are at different distance from wire)

so we can say B is inversely proportional to r

Hence we say that the point which is far from wire will have less value of magnetic field as compared to the point which is near to wire.

So as distance of Q point(r2) is less as compared to distance of point p (r1) so there at point Q we will have maximum magnetic field......

Note: i had assumed the wire to be of infinite length

if it help then mark it as brainliest and feel free to ask any doubt related to solution....