Questions Received via Ask Me Email

A question from maths

There are six points in a plane. The largest distence between two points is D and smallest distence is d. Find the ratio D/d.

A Question based on Gauss Law

A circular ring of radius r made of a nonconducting material is placed with its axis is parallel to a uniform electric field if the ring rotated by 180 degrees Does the flux changes? A Q charge is uniformly distributed on a thin spherical shell If a point charge is brought near it what is the field at the center?Is u r answer depends on whether it is conducting or nonconducting?

An Idea on UltraSonics

Sarin John Skaria Asked:

“We know that a kidney stone is broken down by using ultrasound waves.now think about creating a machine which can produce a large no.of ultrasound waves in an instance . it will be useful for us to create a tunnel under a hill,for digging a hole in the ground rapidly.”

A Question based on Pulleys

In a single fixed pulley the velocity ratio is always more than mechanical advantage. Why?

Questions received via chat interface

1. Why the magnetic field lines do not intersect
2. How contact force is related  with physical pendulum?

Some question asked earlier by students

1. TWO IDENTICAL CONDUCTING SPHERES ‘A’ & ‘B’ CARRY EQUAL CHARGES. THEY ARE INITIALLY SEPARATED BY A DISTANCE MUCH  LARGER THAN THEIR DIAMETERS AND THE FORCE BETWEEN THEM IS ‘F’. A THIRD IDENTICAL CONDUCTING SPHERE ‘C’ IS UNCHARGED. SPHERE ‘C’ IS FIRST TOUCHED TO ‘A’ AND THEN TOUCHED TO ‘B’ AND THEN REMOVED. AS A RESULT, WHAT IS THE FORCE BETWEEN ‘A’ AND ‘B’ ?
2. WHEN 20j OF WORK IS DONE ON A GAS,40j OF HEAT ENERGY IS RELEASED.IF THE INITIAL INTERNAL ENERGY OF THE GAS WAS 70j.WHAT IS THE FINAL INTRENAL ENERGY?
3. the graph for total energy stored in capacitor versis capacitance comes out to be rectangular hyperbola:
   which of the two, charge on the capacitor or potential used to charge it is kept constant for this graph
4. Wat does stereopsis mean?

A Question from Heat and Thermodynamics

A thermo stated chamber at a height ‘h’ above the earth’s surface and maintained at 30 degree Celsius has a clock fitted with an uncompensated pendulum. The maker of the clock for the chamber mistakely designed it to maintain correct time at 20 degree Celsius. It is found that if the chamber were brought to earth’s surface the clock in it would click correct time. The coefficient of linear expansion of the material of pendulum will be………………..

- Himani