Physics Review #1 LCHS Dr.E

In order to produce a magnetic field, an electric charge must be (A) stationary (B) moving (C) positive (D) negative B

The diagram shows the lines of magnetic force between two north magnetic poles. At which point is the magnetic field strength greatest? (A) A (B) B (C) C (D) D (B) B

(C) toward the top or bottom of the screen (D) no change in direction NORTH SOUTH A beam of electrons is directed into the electric field between two oppositely charged parallel plates. The force exerted on the electrons by the magnetic field is directed (A) into the screen (B) out of the screen (C) toward the top or bottom of the screen (D) no change in direction (D) toward the top of the screen

Magnetic fields are produced by particles that are (A) moving and charged (B) moving and neutral (C) stationary and charged (D) stationary and neutral (A) moving and charged

Magnets exert ____ on each other. A. Charges B. Connectivity C. Forces D. Radiation C

If you break a magnet in half twice, you will have... A. 2 complete magnets with a North and South Pole B. 2 magnets with 1 north pole and 1 south pole C. 4 magnets with 2 north poles and 2 south poles D. 4 complete magnets each with a North and South Pole D

A. The space around the magnet in which a magnetic force is exerted. A magnetic field is... A. The space around the magnet in which a magnetic force is exerted. B. A producer of magnetic forces. C. A picture of many magnets in a field. D. The iron that you place on top of a magnet. E. A bad Kevin Costner movie. A

Clusters of aligned atoms are called... A. Magnetism B. Magnetic Domains C. Magnetic Fields D. Magnetic Poles B

A strong electromagnet is... A. A current-carrying coil of wire with many loops B. A current-carrying coil of wire C. A wire with many loops D. A coil of wire A

A. Half as much as in the single loop If a single looped, current-carrying wire is bent into another loop, the concentration of the magnetic field lines inside the double loop is... A. Half as much as in the single loop B. Four times as much as in the single loop C. The same as in the single loop D. Twice as much as in the single loop D

A. perpendicular to the magnetic field lines. The force is greatest on a charged particle when the particle moves in a direction... A. perpendicular to the magnetic field lines. B. parallel to the magnetic field lines.  C. at a 45 degree angle.  D. in a circle.  A

If the direction of current in the wire is reversed, the deflecting force acts in the... A. Same direction B. Opposite direction C. Downward direction D. Upward direction

What does placing a piece of iron into a current-carrying coil create? A. A smaller magnetic field.  B. A breaking of the coil. C. An electromagnet. D. A magnetic field. 

What is a device used for changing the potential difference (voltage) of alternating currents? A. An ammeter. B. A voltmeter.  C. A direct current.  D. A transformer.  E. Not possible

What is a device used for changing the current (amperage) of alternating currents? A. An ammeter. B. A voltmeter.  C. A direct current.  D. A transformer.  E. Not possible

What is a device used for changing the power (watts) of alternating currents? A. An ammeter. B. A voltmeter.  C. A direct current.  D. A transformer.  E. Not possible

A typical solenoid that has current flowing through it behaves like… a A typical solenoid that has current flowing through it behaves like… a. wire b. a bar magnet c. electricity d. transformer

In a turbine, the blades spin the magnet rapidly, rotating the magnet inside the coil of the generator producing a(n) A. voltage B. resistance C. electric current

Which metal does NOT have a natural magnetism? A. Cobalt B. Nickel C. Copper D. Iron

What is a machine that produces electrical current by rotating a coil within a stationary magnetic field? A. Generator B. Transformer C. Light bulb

What is the AVERAGE period time between when Earth’s poles have switched in the past? A. 10,000 years B. 100,000 years C. 200,000 years D. 750,000 years

Charged particles from outer space are deflected by Earth’s _____. A. magnetic field B. atmosphere C. ozone D. lithosphere E. greenhouse gas

Magnetism is related to ________. A. biology B. chemistry C. electricity D. geology E. Psychology F. None of these

Sunspots on the sun’s surface are places where: A. The sun has been burnt B. Gravity is greater C. Magnetism is less D. Magnetism is greater

How is a magnetic field produced? A. By polar attraction B. By the motion of electric charge. C. By the nature of a magnetic field

Mars no longer has a magnetic field because a. The core has solidified b. The magnetic field has reversed c. Because Mars is spinning faster d. It is a permanent magnet

According to Faraday’s law the induce voltage in a coil is ______ to the product of number of loops A. Not related B. Inversely proportional C. Proportional

A changing magnetic field induces a/an _____ A. Magnetic field B A changing magnetic field induces a/an _____ A. Magnetic field B. Electric field C. Force field D. Circuit breakers

For a transformer: The primary voltage is 120 volts and the primary amperage is 5 amps, the power is _____ watts. 600

For a transformer: If the primary voltage is 120 volts and the primary amperage is 5 amps, the power is _____ watts in the secondary. 600

For a transformer: If the primary voltage is 120 volts and the primary amperage is 5 amps with 1:20 ratio, what is the voltage in the secondary? 2400

For a transformer: If the primary voltage is 120 volts and the primary amperage is 5 amps with 1:20 ratio, what is the amperage in the secondary? 0.25

For a transformer: The secondary voltage is 120 volts and the secondary amperage is 5 amps, the power is _____ watts. 600

For a transformer: If the secondary voltage is 120 volts and the secondary amperage is 5 amps, the power is _____ watts in the primary. 600

For a transformer: If the secondary voltage is 120 volts and the secondary amperage is 5 amps with 1:20 ratio, what is the voltage in the primary? 6

For a transformer: If the secondary voltage is 120 volts and the secondary amperage is 5 amps with 1:20 ratio, what is the amperage in the primary? 100

For a transformer: The primary has a voltage of 6000 volts and amperage is 200 amps. What is the power in the primary? 1,200,000

For a transformer: The primary has a voltage of 6000 volts and amperage is 200 amps. The secondary has a voltage of 480,000 volts and amperage is 2.4 amps. What is the power in the secondary? 1,200,000

For a transformer: The primary has a voltage of 6000 volts and amperage is 200 amps. The secondary has a voltage of 480,000 volts and amperage is 2.4 amps. What is the efficiency of the transformer? 1,200,000