A coach who teaches private and group tennis lessons in Camden County was arrested Monday after he was accused of showing a naked photo of himself to one of his teenage students, investigators said. Ovidiu V. Dragos, 60, of Moorestown, was charged with second-degree endangering the welfare of a child, third-degree promoting obscene material to persons under 18-years-old, fourth-degree stalking, and harassment, according to a release from the Camden County County Prosecutor’s Office. Dragos conducts private and group lessons at Cherry Hill Health and Racquet Club in Cherry Hill, the office said…