An iron rod connects the opposite points of a circular iron ring. If the system is equally heated, will the ring remain circular? Explain.

An iron rod is fitted along the diameter of a circular iron ring. Explain, whether the ring remains circular or not, when the system is heated.

An iron sphere is to be passed through a circular brass ring. At 20^(@)C , the diameter of the sphere is 25 cm and the internal diameter of the ring is 24.9 cm. If both the sphere and the ring are heated together, at what temperature will the sphere just pass through the ring? alpha for iron =1.2 times 10^(-5@)C^(-1) and alpha for brass =2times10^(-5@)C^(-1) .

An electric current i enters and leaves a uniform circular wire of radius a through diametrically opposite points. A particle carrying a charge q moves along the axis of the circular wire with speed v. What is the magnetic force experienced by the particle when it passes through the centre of the circle ?

A particle is moving in a circular path of radius r with constant speed. Due to change in the direction of motion of the particle continously, the velocity of the particle is changing . But the kinetic energy of the particle remains the same. Explain why ?

A and B are two points on a circular ring made of uniform wire of resistane R. If the part AB of the ring subtends an angle theta at the centre C of the ring as shown below, find the resistance of the ring between the points A and B.

If a circular iron-plate of thickness (1)/(150) cm is made from an iron-sphere of diameter 1 cm , then what will be the radius of the circular plate gt?

Any two points on the circumference of uniform circular conductor are connected to the terminals of a cell. Show that, the resultant magnetic field at the centre of the circle is zero.