Chapter-4|Moving Charges and Magnetism| NCERT 12th Physics: Application of Ampere’s Circuital Law: Magnitude of Magnetic Field of a Straight Wire (Infinite) Using Ampere’s Law: Magnetic field due to a straight conductor at point P, at a distance r from the wire. Now, We will draw a circle with radius r, passes through point P (called […]

Chapter-4|Moving Charges and Magnetism| NCERT 12th Physics: Ampere’s Circuital Law: According to this law, the line integral of a magnetic field B around any closed path in vacuum is µ0 times the net current Inet enclosed by the curve. It is another method to calculate magnetic field strength due to current like Biot Savart’s law.   Ampere’s

Chapter-4|Moving Charges and Magnetism| NCERT 12th Physics: Magnetic Field Due to a Current Carrying Conductor:   Magnetic Field On The Axis of a Circular Current Carrying Loop: Let we consider a circular loop of radius R with Centre C.   Let we consider current element Idl on the top and the bottom. Now, magnetic field

Chapter-4|Moving Charges and Magnetism| NCERT 12th Physics: Magnetic Field Due to a Current Element: Biot-Savart’s Law: Biot-Savart’s law is an experimental law predicted by Biot and Savart. This law deals with the magnetic field induction at a point due to a small current element. Note: Since, only dl have no direction, So we consider idl(current

Chapter-4|Moving Charges and Magnetism| NCERT 12th Physics: Magnetic Field: The space in the surrounding of a magnet or a current carrying conductor in which its magnetic influence can be experienced is called magnetic field.   Oersted’s Experiment: In summer’s of 1820, HC Oersted’s by his experiment concluded that a current carrying conductor detects magnetic compass

Chapter-3|Current Electricity| NCERT 12th Physics: Potentiometer: A long wire (of few metres) of uniform cross section area.   Applications: 1. To measure EMF of a cell: We will find null point on wire where G shows no deflection.   2. To compare of EMF of two cells:   3. To measure internal resistance of a

Chapter-3|Current Electricity| NCERT 12th Physics: Meter Bridge: It is a electrical instrument. It measured the value of unknown resistance. It works on the principle of wheatstone bridge.   Wire of length 1 m=100 cm and uniform cross section area A. Wire must be so that it is temperature independence (does not increase resistance after increasing

Chapter-3|Current Electricity| NCERT 12th Physics: Wheat Stone Bridge: In balanced wheat stone Bridge, If there is no current in mid register(R₅) and X and Y have same potential, then   Proof: Let there is no current in mid register. To Prove:-  R₁/R₂=R₃/R₄   Find the equivalent resistance between A and B.  

Chapter-3|Current Electricity| NCERT 12th Physics: How to Apply Kirchhoff’s Law: 1.  Draw current from one or more cells (According to yourself). 2. Choosing a loop- (I) It should be closed loop. (II) It can involves any number of cells, registers, capacitance, etc. 3. Direction of loop or Path- You can take clockwise, anticlockwise or anyone