Chapter-5|Magnetism and Matter| NCERT 12th Physics: Permanent Magnets: The substances which at room temperature retain their ferromagnetic property for a long period of time are called permanent magnets. Permanent magnet can be made by placing a rod of ferromagnetic material in a current carrying solenoid. The magnetic field of the solenoid magnetises the rod. The […]
Chapter-5|Magnetism and Matter| NCERT 12th Physics: Magnetic Properties of Materials: Materials can be classified as diamagnetic, paramagnetic and ferromagnetic on the basis of susceptibility. Diamagnetism: Diamagnetic substances are those substances which have a tendency to move from stronger to the weaker part of the external magnetic field. When a bar of diamagnetic material is placed
Chapter-5|Magnetism and Matter| NCERT 12th Physics: Magnetic Field Strength at a Point Due to a Bar Magnet: The Strength of magnetic field at any point is defined as, the force experienced by a hypothetical unit north pole placed at that point. It is a vector quantity. The direction of magnetic field B is the direction
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Chapter-4|Moving Charges and Magnetism| NCERT 12th Physics: Conversion of Galvanometer to Voltmeter: Voltmeter: A device used to measure potential difference in a appliance. Voltmeter is always connected in parallel with appliance. Important Concept: The resistance of an ideal voltmeter should be infinity. Example: A voltmeter whose coil has resistance 10 ohm, gives full scale
Chapter-4|Moving Charges and Magnetism| NCERT 12th Physics: Conversion of Galvanometer Into an Ammeter: Ammeter: A device used to measure electric current. Ammeter is always connected in series with appliance. A galvanometer can be converted into an ammeter by connecting a very low resistance called (shunt S) in parallel with galvanometer. Since, Potential difference across Galvanometer
Chapter-4|Moving Charges and Magnetism| NCERT 12th Physics: Moving Coil Galvanometer: Galvanometer is used for detecting and measuring small electric currents. Principle: Its working is based on the fact that when a current carrying coil is placed in a magnetic field, it experiences a torque. Construction: The moving coil galvanometer consists of a coil with a
Chapter-4|Moving Charges and Magnetism| NCERT 12th Physics: Torque On a Current Loop In a Uniform Magnetic Field (Magnetic Dipole): Let we consider a rectangular loop ABCD be suspended in a uniform magnetic field B. Let AB=CD=b and AD=BC=a and I be the current flowing through the loop. Case-1:The rectangular loop is placed such that the
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Chapter-4|Moving Charges and Magnetism| NCERT 12th Physics: Magnetic Dipole Moment of a Revolving Electron (For Hydrogen Like Atom): Let an electron(e⁻) is revolving in a loop(atom), mass m, velocity v and radius r. When electron (e⁻) revolve around nucleus, it constitute a current. Since, q= It, therefore I= q/t = e⁻/t. This
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Chapter-4|Moving Charges and Magnetism| NCERT 12th Physics: Circular Current Loop as a Magnetic Dipole: Main Topic: A current loop behaves as a magnetic dipole Magnetic field lines are always from South(S) to North(N). If we look at the upper face, current is showing clockwise, so it has South polarity. If we look at lower face
Chapter-4|Moving Charges and Magnetism| NCERT 12th Physics: Force Between Two Parallel Current Carrying Conductors: Let we consider two parallel infinite long straight conductors. Note: Two linear parallel conductors carrying current in the same direction attract each other, while carrying in opposite direction they repel to each other. Definition of Ampere:
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