ELECTRIC AND MAGNETIC PHENOMENON

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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.

Asked HEMANT KUMAR

Physics-magnetism

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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?

 

Asked Astha

Electric Discharge in a gas lighter

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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)

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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?

Asked Sha

Light

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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?

Asked Bera altan

ELECTRIC AND MAGNETIC PHENOMENON

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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.

Asked HEMANT KUMAR

Heat requirements for Leidenfrost effect

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I had a simple question that I couldn’t find an easy answer to. I have recently been studying the Leidenfrost effect and the effects it has on water. My question is this, is it possible for metals to heat to the Leidenfrost point? I understand that the Leidenfrost point is quite a bit higher than an elements boiling point. This is true for water and easily observed by placing droplets on a skillet that’s already heated. I guess to summarize my question, do metals have a Leidenfrost point and if so would they act the same way water does?

Asked  Reese Martin

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