Trent builds a model electric motor. when he connects a battery to the motor, the motor spins through a half rotation and stops.

which is the most likely solution to the problem?

replacing the battery, because it is not providing current

installing new brushes, because they are not making a good connection

checking the commutator, because the current is not reversing

adding more wire coils in the armature, because the electromagnet is too weak

You are a sales representative for a company that makes a new alternate fuel for vehicles. you have prepared a presentation for the environmental engineers to sell your new product. what question do you expect the audience to ask regarding whether the new fuel will cause less damage to the environment? a. do we have to change any parts of the vehicle to use this alternate fuel? b. will the vehicles get better fuel mileage with the alternate fuel? c. how much greenhouse gas does your fuel produce compared with current fuel sources? d. is the alternate fuel more expensive than fossil fuel?