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Complete the following statement: The electromotive force is A the maximum potential difference between the terminals of a battery.

Complete the following statement: The electromotive force is  
A  the maximum potential difference between the terminals of a battery.  
B  the force that accelerates electrons through a wire when a battery is connected to it.  
C  the force that accelerates protons through a wire when a battery is connected to it.  
D  the maximum capacitance between the terminals of a battery.  
E  the maximum electric potential energy stored within a battery.
The potential difference across the ends of a wire is doubled in magnitude. If Ohm's law is obeyed, which one of the following statements concerning the resistance of the wire is true?  
A  The resistance is one half of its original value.  
B  The resistance is twice its original value.  
C  The resistance is not changed.  
D  The resistance increases by a factor of four.  
E  The resistance decreases by a factor of four.

Which is the correct answer. No need to show your work.
Complete the following statement: The electromotive force is
A the maximum potential difference between the terminals of a battery.
B the force that accelerates electrons through a wire when a battery is
connected to it.
C the force that accelerates protons through a wire when a battery is
connected to it.
D the maximum capacitance between the terminals of a battery.
E the maximum electric potential energy stored within a battery.
The potential difference across the ends of a wire is doubled in
magnitude. If Ohm's law is obeyed, which one of the following statements
concerning the resistance of the wire is true?
A The resistance is one half of its original value.
B The resistance is twice its original value.
C The resistance is not changed.
D The resistance increases by a factor of four.
E The resistance decreases by a factor of four.

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