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1- A magnet created when there is a current through a coil of wire is considered a....

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Physics

1- A magnet created when there is a current through a coil ofwire is considered

a. electromagnet.
b. a solenoid.
c. polarized.
d. all of the above

2- The radii of the paths that ions follow in a massspectrometer can be used to calculate the charge on the ion.
a. True
b. False

3- The __________ difference between two points separated by adistance d in a uniform field is represented by the equation ΔV =Ed.

a. electrical
b. potential
c. equipotential
d. volt

(I think its option B)

4- Electricity sent over power lines needs


a. low voltage and high current.
b. low voltage and low current.
c. high voltage and high current.
d. high voltage and low current.

5-Three resistors, 20 Ω, 40 Ω, and 40 Ω, are connected inparallel across a 12.0 V battery. What is the equivalent resistanceof the this circuit diagram?


a. 10 Ω
b. 20 Ω
c. 30 Ω
d. 40 Ω

6-Transformers can change __________ with fairly little waste ofenergy.

a. magnetic fields
b. power
c. resistances
d. voltages

7-The _________ is proportional to the strength of the magneticfield.

a. magnetic flux per unit area
b. amount of space taken up by the magnet
c. mass of the magnet
d. size of the magnet

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