2 laws of magnetism correct answers 1. like poles repel each other, unlike poles attract each other
2. Gauss' Law
Gauss' Law correct answers The strength of a magnetic field is:
-proportional to the product of the pole strengths between 2 magnets
-inversely proportional to the square of the ...
Biophysics Exam 3 || with Accurate Answers 100%.
2 laws of magnetism correct answers 1. like poles repel each other, unlike poles attract each
other
2. Gauss' Law
Gauss' Law correct answers The strength of a magnetic field is:
-proportional to the product of the pole strengths between 2 magnets
-inversely proportional to the square of the distance between the 2 poles of the magnet (Inverse
Square Law)
Which of the following devices can increase or decrease voltage by a set amount?
battery
capacitor
transformer
A & C correct answers transformer
the idea that electricity could be induced in a wire by moving it through a magnetic field was
discovered by:
Faraday
Roentgen
Tesla
Oersted correct answers Faraday
reducing the # of coils in a secondary wire will result in:
increased voltage
reduced voltage
no effect on voltage
decrease current correct answers reduced voltage
a device that converts mechanical energy into electrical energy is a:
motor
generator
transformer
electromagnet correct answers generator
A step-up transformer results in:
decreased current
decreased voltage
A&B
none of the above correct answers decreased current
The autotransformer:
uses self-induction
uses 2 coils of wire
does not use a magnetic core
, is not usually found in an x-ray machine correct answers uses self induction
With alternating current, the north and south poles of the magnetic field surrounding the wire
change each time the electrons change direction.
True
False correct answers True
If the voltage on the primary side of a transformer is 100 volts, and the turns on the primary side
is 50 windings and the secondary side is 150, what will change?
the voltage will increase to 200
voltage will decrease to 25
amperage will double
amperage will decrease to 1/3 correct answers amperage will decrease to 1/3
if the secondary coil of a transformer has less windings than primary coil, it is an
autotransformer.
True
False correct answers False
An alternating current is represented by a ____ line.
sinusoidal
horizontal
vertical
descending correct answers sinusoidal
In a series circuit, what can not change throughout the circuit?
resistance
amperage
voltage
power correct answers amperage
The flow of electrons along a conductor is:
electric current
electrostatics
electric potential
resistance correct answers electric current
A flashlight holds two 1.5 volt batteries in series for total EMF of 3 volts. The current flowing
when the flashlight is turned on is 0.5 amp. How much electrical resistance is being given by the
flashlight's bulb and wires? correct answers 6 ohms
If a circuit contains 30 ohms of resistance with 60 volts applied, the current following will be:
correct answers 2 amps
Milliamperes is the unit used to measure correct answers the flow rate of electrons in a circuit
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