Why has the magnet a horse-shoe shape?

Why has the magnet concave pole faces?

MULTIPLE CHOICE QUESTIONS (MCQs): In which of the following kinds of ovules, the embryo sac is horse-shoe shaped?

A magnet has poles-

A loop of iregular shape carrying current is located in an external magnetic field. If the wire is flexible, why does it change to a circular shape?

Figure shows three different orientations of a circular coil rotating in the magnetic field between the poles of a horse shoe magnet. In which orientation during rotation with uniform angular speed) is the induced e.m.f. greatest?

Figure shows three different orientations of a circular coil rotating in the magnetic field between the poles of a horse shoe magnet. Determine the direction of induced current in the coil, if the rotation is anticlockwise as viewed by the reader.

Why do gases have neither a definite shape nor a definite volume ?

Ten horses are running a race. In how many ways can these horses come in the first, second and third place, assuming no ties ?