The re<span>sistance of the second wire is 16 R.
where R is the resistance of the first wire.
R = </span>ρ

where l = length of the wire
A = area of the wire
A =

where, r =

Thus, on finding the ratio of resistance of the two wires, we get,

here, R1 = R
l1 = 8m
l2 = 2m
A1=π

A1=π

we get. R2 = 16R
The answer to this question would be:C. 22mf
In this question, there are two capacitors that connected in parallel. The formula to count the capacitor is the opposite of the formula used for the resistor. If constructed in series, the capacitor will have reduced capacitance. For parallel condition the equation would be:
Ctotal= C1+C2
C total= 2 mf+ 20mf= 22mf
False the electro magnet is controlled electrically so its like turning on/off a switch thing of the magnets they have at junkyards.
Answer:
a). a=0.2 
b). x=10m
c). v=2
Explanation:
Force forward push = 2000N
Resistive force due water=1800N
Net force=2000N-1800N
Fn=200N
m=1000kg
t=10sec
a).

b).

c).

The units for mass are grams (g) and kilograms (kg)
the units for volume are millilitres (ml) and litres (l)