An air-filled parallel-plate capacitor has a capacitance of 1 pF. The plate sepa

Question

An air-filled parallel-plate capacitor has a capacitance of 1 pF. The plate separation is then doubled and a wax dielectric is inserted, completely filling the space between the plates. As a result, the capacitance becomes 2 pF. What is the dielectric constant of the wax? 0.25 0 50 2.0 4.0 8.0 A 60-watt light bulb carries a current of 0.5 ampere. The total charge passing through it in one day is what? 36.200 C 43.200 C 24.200 C 18.200 C 12.000 C A wire with a length of 150 m and a radius of 0.15 mm carries a current with a uniform current density of 2.8 times 10^7A/m^2. What is the value of the current through this wire? 0.63 A 2.0 A 5.9 A 300 A 26000 A

Explanation / Answer

15 )

Q = I*t

I = current

t = time in second = 1 day = 24 hr * 60 min * 60 s

Q = 0.5 * 24 * 60 * 60 = 43200 C

16 )

J = I/A

A = pi*r^2

I = J*A

J = current density

I = 2A

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