In: Physics
_____1.An electroscope is charged by induction. If the charge on the electroscope is now negative, which statement is true?
Electrons left the charged object used in the induction process and entered the electroscope
Electrons left the electroscope and entered the ground used in the process.
Electrons left the ground and entered the electroscope.
Electrons left the electroscope and entered the charged object used in the process.
_____2. A main difference between gravitational and electric forces is that electrical forces
Attract C. repel or attract
Act over shorter distances D. none of these
_____3. The electrical force between charges is strongest when the charges are
Close together B. far apart C. The force is constant everywhere.
_____4. Charge carriers in a metal are electrons rather than protons because electrons are
Smaller B. loosely bound C. negative D. located inside the nucleus
_____5. Every proton in the universe is surrounded by its own
Electric field C. both A and B
Gravitational field D. none of these
1)
To charge the electroscope negative, we bring a positively charged
object near the electroscope. So the area near the charged object
will be negative and the opposite area will be positively charged.
If the positively charged area is grounded, electrons will flow
from the ground to the electroscope. Finally, if we remove the
charged object, the electroscope will be negatively charged.
So the answer is electrons left the ground and entered the
oscilloscope.
2)
Answer is C
Gravitational forces can only attract but electric forces can both
attract and repel.
3)
Electrical force will be strongest when the charges are
close together.
Electric force is inversely proportional to the square of the
distance between them. So force is greatest when the charges are
close.
4)
Electrons are lighter and loosely bound to atoms.
So charge carriers in metals are electrons
5)
Proton is positively charged. So it will have electric filed around
it. Since it has mass, gravitational field is also present. So the
answer is both electric and gravitational
fields.