Question

In: Physics

_____1.An electroscope is charged by induction. If the charge on the electroscope is now negative, which...

_____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

Expert Solution

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.

genius_generous answered 2 years ago

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