magnetism:current carrying conductor

red color meaning tht q is not complete/confusion/not true

magnetic field?

a region or space where current carrying conductor OR a moving charge perpendicular to the field lines experiences a force

magnetic field lines from which to which direction when externel?

North to South

what happens when like poles are kept near?

like poles repel eachother, and a null point is created b/w them

what a null point?

when the force are equal and opposite in directions making the resultant zero

conditions to be fulfilled for the magnet diagrams?

what does straight parallel lines mean? and where does this occur?

the field is uniform, inside the magnet

magnetic field lines from which to which direction when internel?

south to north

magnetic field strength?

measured in tasla,

it is force acting per unit current, per unit length on a current carrying conductor perpendicular to the field lines

OR

it is force acting per unit chagre, per unit velocity on a current carrying conductor perpendicular to the field lines

how to find the force acting on current carrying conductor OR moving charge? tell both scenario

define the tasla.

it is when the produced force of 1Newton acts on a current carrying conductor perpendicular to the field lines with a current of 1Ampere and length of 1meter

when is flemings left hand rule used? finger labelling? and how to find field strength in this?

it is used when the system itself produces the force and is given the current direction & field direction

field strength is found by B=F/IL

tell the force by using the flemings left hand rule, state why

current is the flow of positive charge but here electron is negative so we take direction of charge opposite

what will happen when a square framed current carrying wire is lowered into a magnetic field? tell both scenario.

[_]

1)when both are perpendicular

the [ ] wires will face no effect as the force produced by them will cancel out resulting in no torque/moment as {the moment produced of both current carrying wires will be opposite in direction cancelling out eachother} they have no perpendicular distance between them (same magnitude but opposite in direction). the _ wire can or wont create effect (rotate) reliant on if perpendicular distance given

2)when one is at an angle with another

the [ ] wires will create a torque/moment as the force produced by them have a perpendicular distance b/w them causing the frame to rotate until the perpendicular distance finishes (same magnitude but opposite in direction). the _ wire can or wont create effect (rotate) reliant on if perpendicular distance given

{there can or wont b an effect dependant on if theres any perpendicular distance with the produced force irrelevant of if the current carrying wire and magnetic field is perpendicular or not}

when is the right hand thumb rule used? and how to find field strength in this?

to find the direction of the magnetic field by only the direction of the current carrying (single) wire

field strength is found by B=Iμ₀/2πR           

what will happen when 2 current carrying conductor are placed near together? tell both scenarios

1) like currents

as the diraction of the magnetic field made by both current carrying conductor will be in the same direction, they will attract causing the force produced to be inwards

2)unlike currents 

as the diraction of the magnetic field made by both current carrying conductor will be in the opposite direction, they will repel causing the force produced to be outwards

how to find the force that is produced at wire2 by wire1(vice versa)

as the current in both wires are different, will the produced force be diff or same?

the force produced will be same magnitude as force is directly perpendicular to the product of the two currents

why is a current balance used?

to measure the magnetic field strength of a magnet

how is the magnetic field strength calculated? tell both scenario

our lena dena is w the thing on the scale, the q will alwys b wire focused

1)when current carrying wire on the scale

The scale tells us the net force acting on it

So when there is no current in the wire so the weight will be the net force on the reading[Fn=W], BUT when current is going through the wire, the wire will generate a force produced upwards (we found this out by FLH) thus this reading will decrease as NOW the reading will show the net force as Weight-Magnetic force[Fn=W-F].

We can calculate B through this

2)when the magnet is on the scale

The scale tells us the net force acting on it

So when there is no current in the wire so the weight will be the net force on the reading[Fn=W], BUT when current is going through the wire, the magnet will generate a force produced upwards (we know this logically) thus this reading will decrease.

By Newtons 3rd law if magnet produce force up, wire will produce force down

when is the right hand grip rule used? how to find magnetic field strength inside?

to find the direction of the magnetic field by only the direction of the current carrying solenoid (coil of wire)

magnetic field strength can be found by B=INμ₀ where N is the number of turns per unit length

which hand rule to use in this? and tell directions of the magnetic field

right hand thumb rule