An automobile battery has an emf of 12.6 v and an internal resistance of 0.0750 ω. the headlights together have an equivalent resistance of 5.10 ω (assumed constant). (a) what is the potential difference across the headlight bulbs when they are the only load on the battery? (enter your answer to at least two decimal places.) v (b) what is the potential difference across the headlight bulbs when the starter motor is operated, with 35.0 a of current in the motor? (enter your answer to at least two decimal places.) v