Answer:
Explanation:
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When two waves are moving toward each other, and their crests line up with each other, it results in a wave with greater amplitu
1 answer:
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Answer:
The resistance of the motor is 8.91 ohms.
Explanation:
Given that,
Voltage of the socket, V = 120 V
Current, I = 2.4 A
Back emf generated by the electric motor is, E = 98.6 V
We need to find the coil resistance of the motor. The new emf on the vacuum cleaner is
The resistance of the motor is given by :
So, the resistance of the motor is 8.91 ohms. Hence, this is the required solution.
Answer:
Efinal / Einitial = 1
Explanation:
Applying Gauss´s Law to a closed spherical surface encircling the sphere of radius R, it can be showed that the electric field, at a distance r> R, behaves like all the charge of the sphere (which is distributed over the surface) were concentrated in the center, so the sphere produces the same electric field as the one created by a point charge located at that point.
The expression for the field E initial is as follows:
So, at a distance r> R, as the center of the sphere is located at the same point, the electric field will be the same as before.
The expression for E final is as follows:
So the ratio is equal to one.