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# Monthly Archives: June 2017

## mechanics

The hook to hang  a ceiling fan is not in the ideal point. I wish to hang the fan appox 3feet away from the hook and below 2feet by mean of a iron rod bent/fabricated/designed accordingly joining/hanging it to/from the available hook as i mentioned. please mention some designs for iron rod that would keep the balance right for the purpose.

## ELECTRIC AND MAGNETIC PHENOMENON

A 100 m long thread carries charges uniformly distributed along its length. An electron, 10 cm away from the centre of the thread along a line perpendicular to the thread experiences an attractive force of 2.7 × 10−12N. Calculate the total charge on the thread.

## Physics-magnetism

A coil in the shape of an equilateral triangle of side 0.02m is suspended from a vertex such that it is hanging in a vertical plane between the pole pieces of a permanent magnet producing a horizontal magnetic field of 5*10^-2 T.Find the couple acting on the coil.When a current of 0.1 ampere is passed through it and the magnetic field is parallel to its plane.
Problem-What will be the value of alpha in F=iLBsin(alpha) and how did we get the value of alpha?

## Electric Discharge in a gas lighter

We know that in gas lighter used to light a stove in the kitchen, spark is produced by piezoelectric effect. The Anode is in the form of a rod and the cathode is a cylinder. My question is, is the spot where the spark hits the cathode random ? (Since cathode is circular,the spark has equal probability of hitting any where on the circle) or is it dependent on any other factor.

Asked Rakesh Khanna A

## Physics(Electromagnetism)

I have a spherical of ferroelectric material.So polarized is permanent Which is located in an external electric field and We want to find it depolarization field. How can we calculate potential and depolarization field?

## Light

What is the difference between opaque and transparent objects in terms of the size of atoms? For example, why a piece of diamond allow light to penetrate itself, but a piece of coal doesn’t even if they are composed of the carbon atoms?

## ELECTRIC AND MAGNETIC PHENOMENON

A 100 m long thread carries charges uniformly distributed along its length. An electron, 10 cm away from the centre of the thread along a line perpendicular to the thread experiences an attractive force of 2.7 × 10−12N. Calculate the total charge on the thread.