A unit of induction is said to exist at a point where the force per unit charge experienced by a positive test charge, moving with a velocity of 1ms-1 in the direction perpendicular to the field is 1 Newton. What is this phenomenon called?

Explanation

The correct answer is Magnetic Field. A magnetic field is defined by the force it exerts on moving charges. In this question, the force per unit charge experienced by a test charge moving perpendicularly to the field indicates the presence of a magnetic field. The force is proportional to the velocity of the charge and the strength of the magnetic field.Option A (Gravitational Field) is incorrect because it deals with forces due to gravity, not magnetic forces.Option C (Magnetic Flux) is incorrect because it describes the number of magnetic field lines passing through a surface, not the force on a moving charge.Option D (Flux) is too general and does not specifically relate to magnetic fields affecting moving charges.