Concept of magnetic dipoles

“Can u explain Concept of magnetic dipoles” – Sam Asked Answer: A magnet always exist in pairs. A magnetic dipole consists of two equal and opposite poles separated by a small distance. The magnetic poles cannot exist alone. Monopoles does not exist. A single current carrying loop is a simple practical  example for a magnetic dipole. Please refer [...]

Why does magnet attract only some of the materials like iron why not plastic ? What is the absolute reason behind it?

Why does magnet attract only some of the materials like iron why not plastic ? What is the absolute reason behind it? (Ankit Gururani posted in facebook) Answer: The answer cannot be limited to a quick reply. The cause of magnetism is revolution of electrons. A revolving electron acts like a tiny magnet just like a [...]

Electrostatics : A Practice Test Paper – 1

Time: 45 min Max. Marks: 25 How does the force between two point charges change, if the dielectric constant of the medium in which they are kept, increases? [1] Name the experiment which established the quantum nature of electric charge. [1] Ordinary rubber is an insulator, but the special tyres of aircrafts are made slightly conducting. Why … Continue reading Electrostatics : A Practice Test Paper – 1

Class XII Physics SOME QUESTIONS FROM CBSE 2004 Board Question Paper

Physics 2004 Set 1 Why is shortwave band used for long distance radio broadcast? Two metals A and B have work functions 2 eV and 5 eV respectively. Which metal has lower threshold wavelength? Draw the voltage-current characteristic of a zener diode. A solenoid with an iron core and a bulb is connected to a … Continue reading Class XII Physics SOME QUESTIONS FROM CBSE 2004 Board Question Paper

SET OF MUST PRACTICE QUESTIONS FOR CBSE PHYSICS CLASS XII (AISSCE PHYSICS 2011)

Hello Dear Students, If you were searching for a set of questions which you cannot afford to leave while preparing for AISSCE 2011 Physics Exam, Here it is. Please practice them carefully. If you have any doubt in answering any of these questions, please feel free to ask at www.askphysics.com The content is being updated … Continue reading SET OF MUST PRACTICE QUESTIONS FOR CBSE PHYSICS CLASS XII (AISSCE PHYSICS 2011)

IMPORTANT FIVE MARKS QUESTIONS FOR CLASS XII

Derive an expression for the Electric field at a point on the (i) axial line and (ii) equatorial line of an electric dipole Describe the principle construction and working of Van de Graff Generator. State Gauss’ theorem and apply it to find the electric field at a point due to A point charge A line … Continue reading IMPORTANT FIVE MARKS QUESTIONS FOR CLASS XII