A wire gets heated when it is bent back and forth. Why?

Why does a wire get heated when it is bent back and forth ?

When wire is bent back and forth, it becomes hot. Why?

A wire when bent in a shape of equilateral triangle encloses area of 726 sq units.Find the area when the wire is bent in the shape of the circle

Why it is not advisable to slide a magnet on an iron bar back and forth during magnetising it?

If the magnetic moment of a straight magnetised wire is p_(m) , what will be its magnetic moment when the wire is bent in the form of a semicircle ?

A long wire carries a steadycurrent. It is bent into a coil of one turn such that magnetic induction at centre is B, then same wire is bent to form a coil of smaller radius of n turns when magnetic induction at centre is B' then

Why do the brake drums of a car get heated, when the car moves down a hill at a constant speed?

A long wire carrying a steady current is bent into a single coil such that magnetic induction at centre is B. Then same wire is bent to form a coil of smaller radius of 4 turns when magnetic induction at centre is B'. Then