you can guess foreign electricity and magnetism oysters experiment magnetic field magnetic force direction of magnetic force so listening in the direction part okay in the direction is foreign either current updates magnetic field so foreign so listen magnetic complex okay so magnetic compass needle deflected okay deflected well current passes through the wire okay so let us assume is circular shape okay deflection along tangent of a virtual Circle so deflection along tangent of a virtual circle with wire as a center and plane perpendicular to the wire foreign [Music] so the magnetic field will be like this [Music] in the Madrid foreign okay finally moving charges moving charges produces magnetic field in the surrounding region in up another charge okay next foreign electric field do not form close to Loop okay assertions so just no time okay so do not form Loop s always always forms Loop originate thank you and terminate outward outward or inward or outward inward or upward downward okay words so current direction each and every point on the space so listen keep up you can see even I'm not a magnetic fields obeys obeys thus principle of superposition magnetic fields B2 Plus foreign okay don't forget this this is important okay literally important okay foreign magnetic force Generations so let me say Q um foreign foreign we know that too so FM is equal to Q into V cross B in a magnetic field of being a rhythm vector quantity velocity of the vector quantity velocity is so listen Allah is another that is velocity that is magnetic field magnetic field okay magnetics field um foreign okay V and B this is the main thing point um yeah so first thing if Theta is equal to 0 degree but Theta 0 degrees magnetic force will be equal to q v b sine zero sine 0 degree it is so the next criteria if Theta is 90 degree okay Theta 90 degrees will be equal to qvb sine 90 degrees what is sine 90 degree it is one but so magnetic force will be equal to q v bucks if so if Theta is equal to 180 degrees magnetic force will be equal to q v b sine 180 foreign foreign [Music] [Music] foreign velocity anti-parallel magnetic force zero charges okay next FM leads the charges to move in a pattern exactly to move in a patterns 90 degrees dimension of B that is magnetic field is Tesla listen foreign Newton okay dimensions is equal to 10 to the power minus 4 Tesla 10 to the power minus 4 Tesla hearted yeah direction of magnetic field and force okay is [Music] literally important is foreign literally import it okay so first step for linear conductor okay linear conductor okay linear conductor 2D hmm so what happens is right hand okay right hand thumb up current okay right hand left another current either way now I'm not a four fingers the magnetic field laughs I'm sorry magnetic fields conducted in the current direction foreign so what we have to do is foreign in word magnetic field s so listen is in everything goes wrong right so listen carefully what happens here inward magnetic field of DNA cross outward magnetic fields foreign foreign you know [Music] so that is inward [Music] foreign foreign foreign down downward one of the most important thing foreign [Music] foreign [Music] foreign or higher potential higher potential is [Music] higher potential or motion now see foreign hmm charge either a velocity in the park velocity is higher potential or motion okay force is comment foreign let us discuss that if magnetic field is parallel to the positive y-axis magnetic field positive y-axis is is moving along positive x-axis positive x-axis in the direction positive x-axis which would be the way Lawrence force be for a lot of foreign [Music] charge okay so positive charge they have given magnetic field okay magnetic field could touch it is velocity right velocity final answer will be for positive charge positive charge force will be along positive Z axis along positive Z axis foreign charge and negative charge negative field fields [Music] so point will be if charge sign changes then Force Direction will also change upper Kingdom positive positive z-axis positive z-axis negative z-axis so for negative Z what happens Force is along negative Z axis is foreign statement of which is foreign foreign that is qvb I'm sorry that is sine Theta is total force will be equal to Q into e Vector plus v cross B vector Q into e plus VBS 19 degrees okay or charge okay so listen this is the formula in a formula Empire the magnetic force continuous [Music] I stands for current length magnetic field okay Mom yeah magnetic fields foreign foreign [Music] so density of charge already is equal to n okay n is equal to okay so total number of charge divided by volume so total number of charge per volume into density of the charge another number of church volume can be written as area into length into n is equal to so each electron will have VD foreign a foreign in parallel I'm just substituting the whole thing is [Music] another this is velocity of all charges confused velocity of all charges either when the velocity of all charges confused into [Music] current density okay current density so in the derivations okay current density upper current density J will be equal to n u okay n q v d n q another v d is [Music] although for a dimensional conductor continuous charges what is the next Formula we know J is equal to current per area current density cross B either because if Theta is equal to 0 degrees F that means another length length s parallel to B Vector okay length of the conductor is parallel to B Vector force will become i l b sine zero so that is 0. if Theta is equal to 90 degree upper Theta is equal to 90 degrees length of the conductor should be perpendicular to the magnetic field f m is equal to ilb sine 90 so total identified so magnetic force will be equal to i b l foreign yeah so these are the important points for continuous charge distribution what is the formula we used in a formula it is equal to iel B sine Theta right in the formula is let us assume foreign particular okay foreign foreign foreign magnetic field s velocity magnetic field 90 degrees if EF okay V is perpendicular to the magnetic field four separated Force magnetic force will at inward okay yes so that is your centripetal force Capital Force okay exactly 90 degrees towards the center towards the center number two words foreign foreign [Music] foreign let me draw so helical abdina circularly foreign foreign foreign foreign path okay suppose in the parameters so r e f time period that is T and Pitch straight line distance straight line distance straight line distance okay straight line distance radius of Helix in a radius of Helix is equal to the centripetal force q v b is equal to sine number 90 degrees 90 degrees correct will be equal to centripetal force nine other MV Square divided by R upper V or Square cancel so balance will be q b in the Yamaha m b is equal to 1 by R is [Music] equal to R radius of the Helix it is mass of your charge foreign charge another velocity of the charge okay positive and being another field magnetic field okay frequency of rotation frequency of rotation is right so linear velocity will be equal to radius into angular velocity in a circular motion foreign is equal to frequency so time period is equal to 2 pi M divided by q b parallel velocity so we parallel is nothing but V cos Theta okay upper pitch will be equal to sorry so pitch will be equal to V cos Theta time period another number 2 pi m divided by q b okay pitch okay directly proportional to V cos Theta is no problem okay so these are the important things now so basic criteria in a Theta values Motion in Combined electric and magnetic field numbers just listen so okay so x y Z okay 1990 degrees that is electric field be there foreign [Music] foreign what I'm going to write you need to Victor so each another name is velocity can be written as V into K cap is equal to Q into e i Vector Plus V K Vector cross B J vector is i j k I cross J abdina positive positive K cross I abdina positive either way up in the total formula what will happen f is equal to Q into e i vector K cross J will be minus I Vector minus v b i vector Q is equal to e minus v b into I Vector is so always e and B should be opposite to each other that is 90 degree okay exact 90 degrees so this is f hmm okay so foreign paper is crossed B and E even a cross to e and B abdina crossed electric field of magnetic fields new velocity okay new velocity new velocity and the new velocity charges force will be zero listen carefully f is equal to Q into e minus okay so e minus VB I cap right so force is 0 if uh Q E minus q v b is equal to 0. e divided by B is equal to V electric field divided by magnetic field will be e obtained velocity selector suppose if for example for example magnetic fields hmm either when the beans ten divided by 5 is equal to B ones are two sir upper V is equal to 2 meter per second in the electron in the 2 meter per second perfect vibrations exactly for example Thompson experiment updated right and the electrons foreign foreign in the electric field in the magnetic field it is a perfect velocity and the velocity charges applications foreign foreign I'm sorry magnet moving charges and magnetism is here no fear right either Instagram ID if you want you can follow next to one shot okay that's it in the part one one shot in the channel usefulness foreign