Electricity and Magnetism (Grades 11-12)
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Electricity and Magnetism
Which action makes use of a magnetic force?
- A store clerk finds the price of an item by moving the item over a laser light.
- A parent measures a child’s temperature by touching a thermometer to the child’s head.
- A person puts a bank card in an electronic reader to buy an item.
- A student measures the mass of a book using a spring scale.
Which action will not induce a potential difference in a coil of wire?
- Moving a magnet through the coil
- Holding the coil in a changing magnetic field
- Holding the coil in a stationary magnetic field
- Moving the coil and a magnet toward each other
A is a device used to increase or decrease alternating current voltages.
- circuit breaker
In a , some or all of the resistance is cut out of the circuit allowing the voltage to push a huge current through the wires.
- surge protector
- circuit breaker
- blown fuse
- short circuit
The diagram below shows the magnetic field lines for a bar magnet. Which statement below best describes the strength of the magnetic field for the bar magnet?
- the magnetic field is strongest at north pole of the magnet
- the magnetic field is strongest at the south pole of the magnet
- the magnetic field is strongest at both the north and south poles
- the magnetic field is strongest in the region between the north and south poles
Look at the drawing below. If each resistor is 2 Ohms, what is the total resistance of the circuit?
- 3 Ohms
- 0 Ohms
- 1 Ohm
- 6 Ohms
A path for electricity is .
- a light bulb
When one bulb goes out, the other bulbs remain lit in a(n) .
- open circuit
- closed circuit
- series circuit
- parallel circuit
A device that can detect small changes in magnetic fields is a .
- iron oxide
Which of the following is NOT a method for making a magnet out of a metal which has the ability to be magnetized?
- by striking the metal
- by exposing the metal to another magnet
- by super radiating the metal
- by running electricity through a coil wrapped around the iron
Like poles of a magnet .
- form an eddy
The units which can align to create a magnet are called .
- magnetic units