ANSWERS TO QUESTIONS FROM VISITORS

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?

Motion in a circular path

aashish davis asked:

“A man moving on a circular triangle of radius 100 m. completes 1 revolution in 4 min. what is his average speed? average velocity in full revolution?”

Average speed = total distance / total time = 2πr/(4×60)= 2.61 m/s

Average velocity = zero since the displacement =0 in full revolution

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.”

Why the current through a conducting wire and a resistor are the same though the resistor has a greater resistance?

When a resistor is connected to a source using conducting wires, both are in series. The current through the wire as well as the resistor is determined by the total resistance of the circuit according to the relation

V = IR

Similarly, when a current is passed through a heating element, the connecting wires are not heated; only the heating element gets heated up since when a constant current is passed, the heat produced is directly proportional to resistance. The current in a series combination cannot change from component to component as current is the rate of flow of charge and the charge supplied by the source must be flowing through all the components connected in series; there is no creation or loss of charge along the circuit.