In an electron is not deflected when passing through a certain region of space, can we be sure that there is no magnetic filed in that region?

An electron is not deflected in passing through a certain region of space. Can we be sure that there is no magnetic field in that region ?

An electron is not deflected on passing a certain region because

A moving charged particle is not deflected when it passes through a region. Can it be said that no magnetic field exists in that region?

Which ray deflects more when passing through magnetic field

A charged particle is found to move in a straight line through some region of space. Can we conclude that no magnetic field exists in that region?

When passing through an electric field, the greatest deflection is experienced by

Statement I : A magnetic needle which can rotate in a horizontal plane undergoes a deflection when current is passed through a conducting wire, placed above and parallel to it. Statement II : A magnetic field is developed around a current carrying conductor.

The magnets of two suspended coil galvanometer are of the same strength so that they produce identical uniform magnetic fields in the region of the coils. The coil of the first one is in the shape of a square of side a and that of the second one is circular of radius (a)/(sqrtpi) . When the same current is passed throught the coils, the ratio of the torque experienced by the first coil to that rxperienced by the second one is