attract each other.
repel each other. ****
exist in pairs.
do not interact.
Magnetic field lines around a bar magnet
are only perpendicular to the magnet.
spread out from one pole and curve around to the other. ****
cross back and forth over one another.
are perfectly straight.
Which of the following would decrease the magnetic field around a wire?
decreasing the current
reversing the poles of the wire
looping a section of the wire into a solenoid ****
increasing the current
What device transforms electrical energy into mechanical energy?
an electric motor ****
A device used to open and close an electric circuit is a(n)
According to Ohm’s law, resistance is equal to voltage divided by
In a series circuit with three bulbs,
the remaining two bulbs will go out if one bulb burns out.
the remaining two bulbs are not affected if one bulb burns out.
the brightness of the light bulbs does not change if more bulbs are added. ****
a switch is never used.
The strength of the force of gravity depends on
the masses of the objects and their speeds.
the masses of the objects and the distance between them.
the weight of the objects and their speeds.
the masses of the objects and their weights. ****
9. According to Ohm’s law, what is the resistance of a light bulb if the applied voltage is
9.0 V and the current is 0.30 amps?
Which of the following statements is true about electric forces? A. Electric forces cause objects to only attract each other. B. Electric forces cause objects to only repel each other. C. Electric forces cause objects to repel or
1)Which of the following statements is true about electric forces? A)electric forces cause objects to only attract each other. B)electric forces cause objects to only repel each other C)electric forces cause objects to repel or
A generator transforms A. Potential energy into kinetic energy B. mechanical energy into electrical energy***** C. Magnetic energy into electrical energy D. Friction into electrical energy Electrical charges that are different A.
One group of students is investigating the properties of charged objects. Their observations are listed below. When two positively charged objects are brought close to each other, they push each other away. When two negatively
It is said that like charges repel. You should have observed that after the sticky side of two pieces of scotch tape are pulled quickly off a table the tapes repel each other. Perhaps each tape has a different type of charge and