"If a wire loop is completely in magnetic field no current is induced as voltage induced is balanced by an equal and opposite voltage. "
My guess for this statement is that the loop wire must be stationary and that voltage is zero if its equal on both sides of the wire
my question is if current will stil be induced if the wire loop is moving but is still completely in the magnetic field.
(I know how as it enters and leaves induced current moves either clockwise or anti so what wil happen if its moving but not entering or leaving)
Best Answer
Electrical generators work by moving loops of conductive material through magnetic fields. These conductors never leave the fields.
Saying that a wire loop is "completely" inside a magnetic field is rather inane. The condidtion that has to be met is that either the field is uniform, the object is stationary, or both. If a conductor is moving through a magnetic field generated by a "normal" source, like a chunk of magnetite held in your hand, then it will generate current unless it perfectly stays at the same flux density (in which case the field would be effectively uniform from the loop's perspective).
If by "moving but not leaving or entering" you meant moving but not crossing lines of flux, then the answer would be that no current is generated, because the EMF will remain balanced. In practice, this can't easily be done because the loop would have to move along a path with precision finer than the atoms inside it (unless you only want no measurable current, in which case the tolerance would be wider).