Which set of physical quantities directly determines the magnitude of the emf that develops across a straight conducting rod moving through a uniform magnetic field?
(a) Magnetic field strength, length of the rod, and the component of the rod’s velocity parallel to the field
(b) Magnetic field strength, length of the rod, and the component of the rod’s velocity perpendicular to the field
(c) Electric field strength, length of the rod, and the rod’s speed
(d) Magnetic field strength, length of the rod, and the rod’s acceleration