Our Energy Sources, Electricity

let us now study, the magnetic induction in

reference to magnetic poles. till now we have studied that. using biosavart law we can find

out the magnetic induction in the surrounding of a current carrying conductor. lets discuss

here, the magnetic induction in surrounding of magnetic poles. about which we can state

that. a magnetic pole. produces. magnetic field in its surrounding. and in this region.

if any other pole is placed. a force. is experienced by, this is the same phenomena. in which we

defined electric field. in the surrounding of a charge. similar to that here we define

magnetic induction also. that force experienced. by a unipole, that is we are considering hypothetically

there is an isolated magnetic pole which we call as unipole. of unit pole strength. at

any point. in space. gives the magnetic induction. at that point. and theoretically for measurement

we can use a very small magnitude. unipole which is generally considered as test pole.

and here we are also considering a unipole which is considered to be a north pole which

is analogous to positive charge in magnetic field. like for example in a region if electric

field, is equal to e vector. then at a point if we place a charge q. positive charge q

it experiences a force. in the direction of electric field. and if it is placed at point

p we can write that electric field strength at point p is given as the force experienced

by the charge divided by the charge. and for precise and accurate analysis we consider

a test charge. now similar to this if in a region a magnetic induction exist which is

given as b vector. and here at a pint p we place a magnetic north pole which is having

a pole strength m. then we say the north pole experiences a force in the direction of magnetic

induction just like the positive charge experience in electric field. and in this situation the

magnetic induction at point p is given as the same force. per unit, magnetic pole this

m n. you can also consider it m-n-not which is the notation for a test, magnetic pole.

similar to electric field where we consider a positive charge. produces electric line

of force in its surrounding. away from it. and a negative charge produces. electric field

in its surrounding such that electric lines of forces are directed into the charge. similar

to this-this is theoretical case. because practically, magnetic lines can never originate.

but if unipole is considered in existence we can say that a north pole produces magnetic

induction in its surrounding. just like a positive charge away from it. and a south

pole produces magnetic field in the surrounding. in such a way that every point in surrounding.

magnetic field, lines are radially into it. practically the phenomena of magnetic induction

is valid but phenomena of magnetic line of force can never be realized in nature as.

unipole can never exist, but how. magnetic lines of forces exist in the surrounding of

a bar magnate you already seen. now we’ll analyze it in more detail. in continuation

we can discuss about the force, of magnetic field on magnetic poles. which is also similarly

explained like the force on electric charges. say if in a region a uniform electric field

e exist. you know that in this situation at any point if we place a charge plus q. then

the charge experiences a force f is equal to q-e in the direction of electric field.

and if at any point if we place a charge minus q it experiences a force opposite to the direction

of magnetic field that is of magnitude q-e. similar to this if in a region a uniform magnetic

field exist, which is having, magnitude of magnetic induction b. at any point if we place

a magnetic pole with pole strength, m, and if it is of nature north pole. then similar

to this situation we can see that the pole experiences a force. m-b in the direction

of, magnetic induction. and if there is a pole which is of pole strength m and it is,

nature of south pole. then it experiences a force which is opposite to the direction.

of magnetic field and it is of magnitude m-b only. so here we can see that. in case of

electric field if we talk about, behavior of. positive charge. in electric field, it

is. similar to the. behavior of. north pole. in magnetic induction vector. and similarly

we can talk about behavior of negative charge in electric field. is equivalent to behavior

of a south pole. in magnetic field. so you just remember. in coming topics also there

is lot many characteristics of magnetic poles and magnetic induction will relate. with those

of charges in electric field.

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