A Conducting Rod of Length ℓ= 25 Cm Is Placed

A conducting rod of length ℓ= 25 cm is placed on a U-shaped metal wire that is connected to a lightbulb having a resistance of 8.0 Ω,as shown in the figure.The wire and the rod are in the plane of the page.A constant uniform magnetic field of strength 0.40 T is applied perpendicular to and into the paper.An applied external force pulls the rod to the right with a constant speed of 6.0 m/s.What is the magnitude of the emf induced in the rod?

A) 0.20 V
B) 0.30 V
C) 0.40 V
D) 0.50 V
E) 0.60 V