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tatuchka [14]
4 years ago
8

A current I flows through a uniform wire of dimater d , when the mean drift velocity is v . the same current flow through the wi

re of dimater d/2 made up of same material the mean drift velocity of electron is?
Physics
1 answer:
Alexandra [31]4 years ago
7 0
. A positive charge, Q, is located in a magnetic field, B, which is directed toward the right, as shown in the figure above. If Q travels toward the top of the page, the direction of the magnetic force on Q is a. toward the right. c. away from you, into the page. b. toward you, out of the page. d. There is no magnetic force. 12. Which conversion process is the basic function of the electric motor? a. mechanical energy to electrical energy b. electrical energy to mechanical energy c. low voltage to high voltage, or vice versa d. alternating current to direct current 13. There are four coils of wire being used as electromagnets. They all have the same size and are made up of the same material but have a different number of loops. Which coil will produce the weakest magnetic field when the same amount of current passes through all of the coils? a. a coil having 10 loops c. a coil having 30 loops b. a coil having 25 loops d. a coil having 45 loops 14. A/An _____ is a long coil of wire with many loops used to create a large magnetic field. a. solenoid c. electric motor b. electromagnet d. armature 15. A/An _____ is described as the area around a magnet where other magnets would be accelerated. a. magnetic field c. domain b. magnetic flux d. solenoid 16. Which factor will not affect the strength of a solenoid? a. number of wraps c. radius of the wraps b. strength of current d. core type 17. What are the units of electromotive force? a. newtons c. volts b. newtons per coulomb d. volts per ampere 18. The number of turns on the primary coil of a step-down transformer _____ the number of turns on the secondary coil. a. equals c. is less than b. is greater than d. is unrelated to 19. A generator is used to light a bulb. Energy for lighting the bulb actually comes from a. a plug where the generator is connected to the wall. b. a mechanical input to the generator. c. the magnet in the generator. d. the coil of wire. e. none of the above 20. The principal advantage of AC power over DC power is that a. AC voltage oscillates, whereas DC voltage does not. b. lower voltages are used. c. AC circuits multiply power more easily. d. AC voltage can be transformed more easily. e. AC circuits are safer.  
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36.667

Explanation:

(2.2*10^4)/(10*60)

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Gravity causes objects to be attracted to one another. This attraction keeps our feet firmly planted on the ground and causes th
aev [14]

Answer:

A) G = m³/kg.s²

B) E = kg.m²/s²

Explanation:

A)

The given relation is:

F = Gm₁m₂/r²

where, the units of all variables are:

F = Force = kg.m/s²

m₁ = m₂ = mass = kg

r = distance = m

G = Gravitational Constant = ?

Therefore,

kg.m/s² = G(kg)(kg)/m²

(kg.m/s²)(m²/kg²) = G

<u>G = m³/kg.s²</u>

<u></u>

B)

The given equation is:

E = mc²

where, the units of all variables are:

m = mass = kg

c = speed = m/s

E = Energy = ?

Therefore,

E = (kg)(m/s)²

<u>E = kg.m²/s²</u>

This is the correct answer, which is not present in any option.

4 0
4 years ago
Which is the best reason a writer would use a unreliable narrator
avanturin [10]

Answer: Explanation:

Authors sometimes use an Unreliable Narrator to tell the story, a protagonist who can't be trusted to tell the events accurately. Either they are insane, evil, delusional, forgetful, or just plain wrong... whatever their reasons, the writer uses this technique to 'hook' the reader.

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3 years ago
Why is it necessary to enrich the soil?
enyata [817]
Plants rely on proper soil conditions to give them nutrients and minerals. 
5 0
4 years ago
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A light source emits light with dominant wavelengths in the range of 650 to 690 nm. what is the principle color of light emitted
dsp73

Answer:

Please see below as the answer is self-explanatory.

Explanation:

  • The visible range extends roughly from 400 nm (violet) to 700 nm (red).
  • Below the violet is the ultra-violet spectrum (with higher energy) and above red, we have the infra-red spectrum.
  • The wavelengths in the range of 650 to 690 nm have red as the dominant color.
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