All categories

3 years ago

The potential difference across a resistor increases by a factor of 4. How

Physics

2 answers:

gizmo_the_mogwai [7]3 years ago

6 0

Answer: A - it increases by a factor of 4

Explanation:

Ohm's law is V = IR where V = potential difference, I = current, and R = resistance. Assuming that resistance stays constant (since the question mentioned no change in resistance), we only need to look at "V" and "I" in the equation V = IR.

"V" and "I" are directly proportional. In other words, whatever change happens to "V" will also occur to "I". Since "V" increases by a factor of 4, then "I" will also increase by a factor of 4.

You could also approach this problem by plugging in a change of 4 for the potential difference in the equation: V = I*R.

If we plug in 4V for V, we now have:

4V = I*R

Since the left side increases by a factor of 4, then the right side (only looking at current in this case) will also need to increase by a factor of 4 in order to have the right side stay equal to the left. Therefore, current will also increase by a factor of 4.

Anton [14]3 years ago

5 0

Answer:

Correct option is C it decreases by a factor of 2

You might be interested in

What does the vibrating object do to the air particles around it ?

Westkost [7]

Answer:

When an object vibrates, it causes movement in surrounding air molecules. These molecules bump into the molecules close to them, causing them to vibrate as well. This makes them bump into more nearby air molecules.

7 0

3 years ago

which element is reactive an element whose atoms atoms have seven valence electrons or a element whose atoms have eight valence

likoan [24]

Elements with 7 valence electrons are extremely reactive, while elements with 8 valence electrons practically don't react at all.

This is caused by the fact that all molecules want to have 8 valence electrons; that's just the scientific fact. So, if an element already has 8 valence electrons, it doesn't need to react with anything. If the element only has 7 valence electrons, however, it really wants to react with something with 1 valence electron to get to that special number 8.

7 0

3 years ago

An electron moves with velocity v⃗ =(5.9i−6.4j)×104m/s in a magnetic field B⃗ =(−0.63i+0.65j)T. Determine the z-component of the

HACTEHA [7]

Answer:

Explanation:

Force on the electron = q ( v x B )

q = - 1.6 x 10⁻¹⁹

v = (5.9i−6.4j)×10⁴

B = (−0.63i+0.65j)

v x B = (5.9i−6.4j)×10⁴ x (−0.63i+0.65j)

= (3.835 - 4.032 ) x 10⁴ k

= - 1970 k

Force on the electron = q ( v x B )

= - 1.6 x 10⁻¹⁹ x -1970 k

= 3.152 x 10⁻¹⁶ k

z-component of the force on the electron

Fz = 3.152 x 10⁻¹⁶ N

7 0

3 years ago

A skydiver is about to jump from an airplane that is 1,500 meters above the ground. The diver has a mass of 125 kg. What is the

blondinia [14]

Gravitational Potential energy is the energy stored with regard to position.

the equation for potential energy is as follows

P.E = mass x gravitational acceleration x height from the ground

gravitational acceleration - 9.8 ms⁻²

substituting the values in the equation

P.E = 125 kg x 9.8 ms⁻² x 1500 m

P.E = 1 837 500 J

therefore the potential energy of the diver at 1500 m high is 1 837 kJ

5 0

3 years ago

Rough surfaces do not absorb radiation as well as smooth <br> True <br> False

AnnZ [28]

In my opinion the answer is false

5 0

3 years ago