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A metal rod moves at a constant velocity in a direction perpendicular to its length. A constant, uniform magnetic field exists in space in a direction perpendicular to the rod as well as its velocity. Select the correct statement (s) from the following : 

1. The entire rod is at the same electric potential 

2. There is an electric field in the rod 

3. The electric potential is highest at the center of the rod and decreases towards its ends 

4. The electric potential is lowest at the center of the rod and increases towards its ends.