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Eva8 [605]
3 years ago
13

Also need help with 20 & 21 please

Physics
2 answers:
SSSSS [86.1K]3 years ago
5 0
Number 20 is B and 21 is C
Hoochie [10]3 years ago
5 0
A density is a physical change
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As a new electrical technician, you are designing a large solenoid to produce a uniform 0.170 T magnetic field near its center.
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Answer:

Explanation:

Magnetic field = permeability x turn density x current

Magnetic field = 0.22T

turn density = 4150 /1.6 = 2593.75 t/m

permeability : µ = k µ°

µ°= 4 π 10^-7

k = 1

I = 0.22 / 4 π 10^-7 * 2593.75 = 0.22 10^7 /32594 = 67.497 A

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poizon [28]
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3 years ago
150c passes through cell in 30 seconds. cell has a potential difference of 12v. what is current in the circuit
zzz [600]

The current in the circuit is 5 A

Explanation:

The intensity of current is given by the equation:

I=\frac{q}{t}

where

I is the current

q is the amount of charge passing through a given point of the circuit in a time interval of t

For the cell in this problem, we have

q = 150 C is the charge

t = 30 s is the time interval

Substituting into the equation, we f ind

I=\frac{150}{30}=5 A

Learn more about current:

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Which other element is most likely to be a nonreactive gas?
krok68 [10]

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