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Magnetic field is produce by

E1 earth magnetic field

2m

Current carrying wire

3 moving charge

4variable elcrtric field

5 bar magnet

What is the values of magnetic field and electric field at point A and B

At point A m field is not zero neither on point B. But at point B e filed is zero but not at point A

Wat is the vector form of biot law and analyse it

dl is the length of current carrying wire (small)

r is the the distance between the point where we have to find the magnetic field to the wire

K is equal to unot by 4 pie and it is equal to 10^-7

Unot is the permeability means allowance of magnetic field to pass into a material

dB perpendicular to the wire length taken and perpendicular to the distance between the wire and the magnetic field

So the dit product of B and r is zero

Agnetic field direction is perpendicular to the plane of r and idl

Scalar form of biot law and analyse its units

Si unit of magnetic field is Tesla

=Weber per m² =newton per metre ampere

Unot unit is Tesla metre per ampere

CGS UNIT of magnetic field is gauss which is equals to 10^-4 Tesla

Properties of magnetic field

Follow inverse square law

Long range ( force infinite distance tak lgta hai )

B produce from vector source that is idl but electric field is produce by scale force that is charge

Inside source directly proportional to r but outside in inversely proportional to r

Super position theorem is applied

Medium dependent

Close loop bnata hai

Angle dependent ( idl aur r ke beech ka )

Magnetic field along side of current carrying wire

ZERO

Formula to find magnetic field at the centre of a circular wire

Circular wire plane perpendicular

Loop concept find magnetic field when no. Of turns while radius being constant and when length of wire being constant

Answer

Formulas of magnetic field to calculate it from a wire at distance r

1 infinite wire

2 finite wire semi infinit wire

Formula to find the position where magnetic field will be zero when two parallel wires are placed together

Answer

Magnetic field at a distancex from the axis of a circular wire

And it's graph

Answer

Amoerian circuit law

dl is length of amperian loop

I in inside current of amperian loop always valid but only applicable to calculate magnetic field for symmetric distribution

Magnetic field due to infinite hollow cylinder

M field at centre is zero current he nhi hai cause surface ke along current flow kr rha hai

Outside magnetic field radius of cylinder par depend nhi krta it act as a straight wire

Magnetic field due to solid infinite cylindrical

Current if flowing inside so magnetic field is not zero

Magnetic field at out is same as straight wire

Magnetic field inside thick cylinder if radius

Answer

Analyse about long solenoid small solenoid and toroide

Magnetic field outside solenoid is zero

N represent no. Of loop but n represent no.of loop per metre

If length is increasing while the n is constant then magnetic field will remain same but if N is constant then magnetic will be inversely proportional to length

When we turn the solenoid such that it forms a circular wire type structure then length is taken as 2pie r

Means between the coil it's not zero but a the centre which is formed due it's circular structure it is zero

Here we go for the analysis of magnetic force by a little bit of its differentiation with electric force

Electric force doesn't depends upon the speed of charge particle but the magnetic force do

Magnetic force is perpendicular to velocity and magnetic field so their dit product is zero

And the accln for the velocity is also perpendicular so the dot product of a and v is zero

The accln is only capable to change the direction but not the speed

Magnetic field can't change the speed of the charged particle this follows kinetic engery work done by the magnetic field on charge and power Deliyto charge by B

Impulse imparted on charge particle by magnetic field will be zero if the velocity of charge particle is parallel to the the magnetic field and will be non zero if the particle velocity is perpendicular to magnetic field

In a field a charge particle q is projected and its direction get deviated to upside

How you will identify whether it is electric or magnetic field

By passing a another identical charge Q from the opposite side where the first charge particle was projected

If the charged particle get deviatedto the same dirn where the 1st one got the field will be considered to be electric field but if the scenario is vice versa then it's is magnetic field means the charge we projected get deviated to the opposite of deviation of 1st charge

Charge is projected perpendicular to magnetic field from outside region of field then

Deviation

Deviation when distance is greater than radius

Plane of circular motion

Try to solve this question using the above concept

Lorentz force

Explain the role of magnetic field and electric field when a charge do motion in a combined electric and magnetic field

Then try solving the question using this concept

Mf will change the dirn only but not speed

Ef can change speed and dirn both

So the work done on that charge will only be done by electric field

Read the question only

Here we