Hi! I need some help with some physics questions.
1. When two point charges are moved farther apart, what is true about their resulting electric and gravitational forces?
a. both forces stay the same
b. gravitational force stays the same but electric force increases
c. gravitational force increases but electric force stays the same
d. both forces decrease
IS IT D?
2. the batteries in a digital alarm clock provide a terminal voltage of 9 V. What is the potential difference across the entire clock circuit?
a.4.5 V
b.18.0 V
c.9.0 V
d.6.0 V
IS IT C?
3. Why does the earth have a magnetic declination?
a. the earth's axis of rotation is not constant
b. the magnetic field of the earth is unknown
c. its magnetic poles shift over time and are not aligned to its geographical poles.
d. the north and south poles are improperly named.
IS IT C?
THANKS
1. When two point charges are moved farther apart, what is true about their resulting electric and gravitational forces?
c. gravitational force increases but electric force stays the same
As the distance between two point charges is increased, the electric force between them stays the same because it depends on the charges and remains constant regardless of the distance. On the other hand, the gravitational force between the charges increases because it depends on the masses of the charges and the distance between them, according to the inverse square law of gravitation.
2. The batteries in a digital alarm clock provide a terminal voltage of 9 V. What is the potential difference across the entire clock circuit?
c. 9.0 V
The potential difference across the entire circuit is equal to the terminal voltage of the batteries. In this case, the batteries provide a terminal voltage of 9 V, so the potential difference across the entire clock circuit is also 9 V.
3. Why does the earth have a magnetic declination?
c. its magnetic poles shift over time and are not aligned to its geographical poles.
Magnetic declination refers to the angle between the geographical north pole and the direction of the magnetic north pole at a specific location on Earth. This angle exists because the Earth's magnetic poles are not fixed and can shift over time due to various factors, including changes in the Earth's molten iron core. As a result, the magnetic north pole and the geographical north pole are not perfectly aligned, causing magnetic declination.
1. To determine the answer to the first question, we need to understand the relationship between distance and forces in both electric and gravitational fields. In the case of two point charges, as they are moved farther apart, the electric force between them decreases. This is because the electric force is inversely proportional to the square of the distance between the charges. On the other hand, the gravitational force between two point masses also decreases as they are moved farther apart. This is because the gravitational force is also inversely proportional to the square of the distance between the masses. Therefore, the correct answer is d. both forces decrease.
2. To find the potential difference across the entire clock circuit, we need to understand the concept of terminal voltage. Terminal voltage is the voltage provided by a power source like a battery. In this case, the batteries in the alarm clock provide a terminal voltage of 9 V. The potential difference across the entire circuit is equal to the terminal voltage. Therefore, the correct answer is c. 9.0 V.
3. The magnetic declination refers to the angle between the magnetic north and true north at a particular location on Earth. To understand why Earth has a magnetic declination, we need to know that Earth's magnetic field is not perfectly aligned with its axis of rotation. The magnetic field is generated by the movement of molten iron within Earth's core. This movement is not perfectly aligned with the axis of rotation, leading to a shifting magnetic field over time. Consequently, the magnetic poles of Earth are not aligned with its geographical poles, resulting in a magnetic declination. Therefore, the correct answer is c. its magnetic poles shift over time and are not aligned to its geographical poles.
You're welcome! If you have any more questions, feel free to ask.