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4 years ago

Which of the following statements are true concerning the creation of magnetic fields?

Physics

1 answer:

Soloha48 [4]4 years ago

3 0

Answer:

A moving electric charge creates a magnetic field at all points in the surrounding region.

An electric current in a conductor creates a magnetic field at all points in the surrounding region.

A permanent magnet creates a magnetic field at all points in the surrounding region.

Explanation:

Magnetic field can be produced by:

- moving charges (i.e. a moving electron, or a current in a conductor)

- A magnet

The strength of the magnetic field produced by a current-carrying wire is

$B=\frac{\mu_0 I}{2\pi r}$

where

I is the current

r is the distance from the wire

As we see from the formula, the magnetic field is produced at all points in the surrounding region, because B becomes zero only when r becomes infinite. The same is true for the magnetic field created by a single moving charge or by a magnet.

The following choices instead are not correct:

- A single stationary electric charge creates a magnetic field at all points in the surrounding region.

- A distribution of electric charges at rest creates a magnetic field at all points in the surrounding region.

Because they involve the presence of stationary charges, and stationary charges do not produce magnetic fields.

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Define the terms resultant and equilibriant of

hjlf

Answer:

1) Resultant and Equilibrant explained below

2) Resultant = 24.18 N in a direction of 11.93° NE

3)Equilibrant = 24.18 N in a direction of 11.93° SW

Explanation:

1) Resultant force: If two or more forces are acting at a certain point, their resultant force would be defined as the force that when applied at that same point, it will have the exact same effect like the two independent forces acting together.

Equilibrant of 2 forces: This is defined as the force exactly equal and has an opposite direction to the resultant

2)a.) we are told that 10 N acts in the direction N 30 East and 15 N acts in the easterly direction, if both forces

act at a point. Thus, coordinates are;

(10cos30,10sin30) and (15,0)

Therefore, resultant coordinate is;

R→ = (10cos30, 10sin30) + (15, 0)

R→ = (15 + 10cos30, 0 + 10 sin 30)

This gives;

R→ = (23.66, 5)

Thus the resultant is;

R = √(23.66² + 5²)

R = √584.7956

R = 24.18 N

b) direction is gotten from;

tan θ = 5/23.66

θ = tan^(-1) 5/23.66

θ = 11.93° NE

c) Equilibrant is equal force but opposite direction. Thus, Equilibrant = 24.18 N in a direction of 11.93° SW

6 0

3 years ago

Why does a rocket continue to rise after it runs out of fuel

Darina [25.2K]

Answer: The surface of the pad pushes the rocket up while gravity tries to pull it down. As the engines are ignited, the thrust from the rocket unbalances the forces, and the rocket travels upward. Later, when the rocket runs out of fuel, it slows down, stops at the highest point of its flight, then falls back to Earth.

5 0

3 years ago

Read 2 more answers

The rate of change of velocity or speed is known as acceleration. If a car increases it speed form 10 to 20m/s in 2 seconds, the

lisov135 [29]

Answer:

A) 5 m/s/s

Explanation:

<u>Given the following data;</u>

Initial velocity = 10m/s²

Final velocity = 20m/s²

Time, t = 2 seconds.

In physics, acceleration can be defined as the rate of change of the velocity of an object with respect to time.

This simply means that, acceleration is given by the subtraction of initial velocity from the final velocity all over time.

Hence, if we subtract the initial velocity from the final velocity and divide that by the time, we can calculate an object’s acceleration.

Mathematically, acceleration is given by the equation;

$Acceleration, a = \frac{final \; velocity - initial \; velocity}{time}$

Substituting into the equation, we have;

$Acceleration, a = \frac{20 - 10}{2}$

$Acceleration, a = \frac{10}{2}$

<em>Acceleration, a = 5m/s²</em>

7 0

3 years ago

What is the difference between an ideal machine and a practical machine

Alik [6]

Answer:

Ideal machines are said to have parts which are weightless , frictionless and strings if any are inextensible. Practical machines have parts which have weights, friction and it causes some loss of work done.

Explanation:

7 0

3 years ago

Read 2 more answers

Eating a banana enables s person to perform about 4×10⁴ J of work. To what vertical height does eating a banana enable a 50kg wo

rjkz [21]

Answer:

80m

Explanation:

potential energy = MGH

p.e = 50 X 10 X h

4x10⁴ = 500 X h

h = 4x10⁴/500

h = 80m

6 0

3 years ago