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I am Lyosha [343]
3 years ago
9

When asked how to create an electromagnet, the best answer would be, "You can create an electromagnet by

Physics
2 answers:
irinina [24]3 years ago
5 0

The correct answer is D. wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current.

Explanation

An electromagnet is a non permanent magnet that is created with an electric current .When current flows through a wire it induces  a magnetic field around the wire. When the wire is wrapped around in a coil, the magnetic field that is induced is concentrated in the center of the coil, creating a north and south pole.   The field is that of a solenoid.  

Electromagnets are usually made by wrapping insulated coil of wire around a ferromagnetic metal. This focuses the electromagnetic field and creates a magnet as long as there is current running trough the insulated wire.

The correct answer is D. wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current.

Norma-Jean [14]3 years ago
4 0
Choice-D will do the job nicely.
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On a straight road (taken to be in the +x direction) you drive for an hour at 50 km per hour, then quickly speed up to 90 km per
dalvyx [7]

Answer:

a) 230 Km b) 76.7 km/h c) Please see below

Explanation:

a) If we can neglect the time while the driver accelerated, the movement can be divided in two parts, each of them at a constant speed:

x = x1 + x2  \\\\x1 = 50 km/h* 1hr = 50 km, \\x2 = 90 Km/h*2hr = 180 km\\

⇒ x = 50 km + 180 km = 230 km

b) The average x component of velocity, can be calculated applying the definition of average velocity, as follows:

vavg,x = \frac{xf-xo}{t-to}

If we choose t₀ = 0 and x₀ = 0, replacing xf and t by the values we have already found, we can find vavg,x as follows:

vavg,x =\frac{230 km}{3 hr} =76.7 km/h

c) The found value of  avg,x is not the same as the arithmetic average of the initial and final values of vx (70 Km/h) due to the time traveled at both velocities was not the same.

If the driver had droven half of the time (1.5 h) at 50 km/h and the other half at 90 km/h, total displacement would have been as follows:

x = 50 km/h*1.5 h + 90 km/h*1.5 hr = 210 km

Applying the definition of average velocity once more:

vavg,x =\frac{210 km}{3 hr} =70 km/h

which is the same as the arithmetic average of the initial and final values of vₓ.

7 0
3 years ago
You want to create an electric field vector E = < 0, 5 104, 0> N/C at location < 0, 0, 0>. Where would you place a p
atroni [7]

Answer:

1.696 × 10^(-7) m on the y axis.

Explanation:

We are given the electric field as;

E = < 0, 5 × 10⁴, 0> N/C

This is written in (x, y, z) co-ordinates. So it means that it lies on the y-axis.

So,

E = 5 × 10⁴ N/C in the y direction.

Formula for Electric field is;

E = kq/r²

where;

k is a constant with a value of 8.99 x 10^(9) N.m²/C²

q is charge on the proton = 1.6 × 10^(-19) C

r is the distance

Thus, making r the subject gives;

r = √(kq/E)

Plugging in the relevant values gives;

r = √(8.99 × 10^(9) × 1.6 × 10^(-19)/(5 × 10⁴))

r = 1.696 × 10^(-7) m on the y axis.

6 0
3 years ago
The use of force to move an object is<br> I
Law Incorporation [45]

Answer:

and unbalanced force

Explanation:

if balanced then the object will exert as much force as you are. its like pushing against a wall. and unblanced force is like pushing against a chair

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3 years ago
The activation energy for the isomerization reaction of CH3NC in Problem 14 is 161 kJ mol 1, and the reaction rate constant at 6
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Answer:

Explanation:

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5 0
3 years ago
Explain why it is important to identify a reference point for any description of motion.
Leya [2.2K]

A reference is critical because it determines how much motion has occurred. You can't determine how much an objected has moved if you don't know where it came from.

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3 years ago
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