Answer:
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Density =mass/volume
Mass=density *volume
=7840*0.08
=627.2kg
Force=mass*g
=627.2*9.81
=6152.8N
Answer:
Radius of bigger loop(R) =4.5cm
Explanation:
Consider a circular path of radius r around the wire. The magnetic field along that path is given by
;
∫B*dl = k*I where I is the current enclosed. From symmetry, ∫B*dl = 2*π*r*B
B = K*I/r, so the magnetic field varies inversely as the loop radius and directly as the current.
The smaller loop current to radius ratio is 12/2.7
The bigger loop current to radius ratio is = 20/R
12/2.7 = 20/R
R = (20 * 2.7)/12
R=54/12
R=4.5cm
<span>when air cools , the temperatures drops, the molecules move slowly taking up less space , the amount of space the air takes ups shrinks , or reduce the air pressure
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