Why don’t the birds perching on high power electric lines do not get an electric shock?

What is an electric shock? It's a a sudden discharge of electricity through a part of the body. For a sudden discharge of electricity, the prime need is a potential difference. When the bird perches on an electric line, it is at a high potential, but it is not subjected to a high potential difference between … Continue reading Why don’t the birds perching on high power electric lines do not get an electric shock?

The Exams are near! Start Smart Preparation (Not just hard work!)

Exam are near. CBSE Exams starts from 1 March. The candidates need to be on toes to score well. Smart work is better than hardwork. Just burning midnight oil alone won't work. Nobody plans to fail, but fails to plan. A failure to plan well may result in ultimate failure. So planning the work based … Continue reading The Exams are near! Start Smart Preparation (Not just hard work!)

Questions received via “Ask a Question” section

How to make a radio? Asked Amritansh prasad   How many time constant will be elapsed before the power delivered to the battery drops to half of its maximum value? Asked Mrityunjoy   Nucleus of an atom consists of neutral neutrons and positively charged protrons... then why do protons not attract neutrons and share charges with them? … Continue reading Questions received via “Ask a Question” section

How was your CBSE Class 12 Physics Exam 2013?

How was the Physics Exam today? Were there questions beyond your comprehension? Were there questions out of Syllabus? Post your responses Now!

Quick Revision Study Materials for Class XII

Electrostatics Current Electricity Thermoelectricity Electromagnetics Electromagnetic Induction AC Circuits Magnetism Ray Optics Physical Optics Atomic Physics Nuclear Physics Semiconductor Devices Communication System Related articles Reference Books in Physics Suggested by CBSE for class XI and XII students New Sample Papers in Physics for Class XII and Science for X  

Electrostatics – One mark and two marks questions for practice

A collection of one mark and two marks questions from ELECTROSTATICS. Practise these for scoring a better and winning the edge over your coscholars!

A Problem from Optics – Reflection of light

Convex and concave mirrors have same radii of curvature R. The distance between the mirrors is 2R. At what point on the common optical axis of the mirrors should a point source of light A be placed for the rays to converge at the point A after being reflected first on the convex and then … Continue reading A Problem from Optics – Reflection of light