Spherical Mirror Problem

A rear view mirror used in a bus has a radius of curvature 3.5 m. If the driver of the bus locates a car at 10.0m behind the bus, find the position, nature and size of the image of the car. Ans: f = r/2=-1.75 m u=-10m v=?

Coulombian force and conductor

what’s effect of  coulombic forces on conductor medium ? amk niazi Ans: In a conductor, the coulombian  repulsive forces  pushes the valence electrons and the electrons move away from the center to the surface ie from the region of stronger force to the region of lesser force, creating a Faraday cage   Incoming search terms:what’s effect of coulombic forces on conductor [...]

What Type of questions are asked in Viva Voce?

The methodology of questioning varies from examiner to examiner. The normal way of questioning is to start from the experiment you are alloted. Example: What experiment are you doing? Ans: To determine the value of unknown resistance using metre bridge...

A problem from light for class X

Sudhanshu Misra posted: "An object is placed at a distance of 10cm from convex mirror of focal length15cm; find the position and nature of image?" Ans: f= 15 cm u=-10 cm v=? substitute the values in the relation and get the value of v as 6 cm The image is virtual, erect and diminished

Some sample questions from Physics for SA 2 of CCE class X

List the three phenomenon responsible for the formation of rainbow. (Ans: Refraction, Dispersion, (Total)Internal reflection) Why do stars twinkle, but planets do not? (Ans: The twinkling is caused by the variation of intensity of light entering our eye from the stars. The starts are far away from us and they are seen in a position different from their … Continue reading Some sample questions from Physics for SA 2 of CCE class X

A large field is possible by inserting a soft iron core inside the solenoid. Explain why?

PukNitish asks: A large field is possible by inserting a soft iron core inside the solenoid. Explain why? Ans: Soft Iron has high magnetic permeability, so all the magnetic field lines prefer to pass through it. Thus the magnetic field inside the solenoid is intensified.