Question

Use the following to answer question 46

I . increase the current


II. use a stronger magnet


III. use thicker wire


IV. reverse the battery


V. add more coils of wire inside the magnet


46. To increase the force with which the wire is pushed when the switch is closed, which of
the following things could be done?

a. I and II only
b. II, III, and IV only
C. II and IV only
d. I, II and V only


47. A group of students had built a homemade motor and were in the process of trying to
test it. When they hooked it up to their battery they found that the wires in their coil got hot, but the coil would not turn. Of the following solutions, which would be their best
course of action to make the motor spin?


a. add more wire to the coil

b. use a stronger magnet

C. use a higher voltage battery

d. plug into an AC source

Answer 1

46.) A

47.) A

Step-by-step explanation:

46.) To increase the force with which the wire is pushed when the switch is closed, the current flowing through the wire should be increased and the stronger magnet should be used.

Remember that

F = BIL

The force is directly proportional to magnetic field B and current I

a. I and II only

47.) Since the wires in their coil got hot, and the coil would not turn, this is overheating which may be as a result of to much voltage supply compare to the length of the length of the coil of wire. To correct this, more wire should be added to the coil.