Ashort, thick, cold wire is the best conductor. a shorter wire will allow electricity to move through at a higher rate than a longer wire. how well a material conducts current is an internal factor affecting resistance. if you double the length of a wire, you cut the resistance in half. if you double the thickness of a wire, you cut the resistance in half. superconductors have no measurable resistance. the higher the temperature of the conductor, the lower the resistance. the resistance in a wire with less thickness is less. thickness, length, and temperature are internal factors that affect resistance. when a light is first switched on, the light bulb's filament has a lower resistance than after it gives off light for awhile. true false

a solenoid is created by wrapping a l = 90 m long wire around a hollow tube of diameter d = 4.5 cm.   the wire diameter is d = 0.9 mm.   the solenoid wire is then connected to a power supply so that a current of i = 9 a flows through the wire.

randomized variablesl = 90 m

d = 4.5 cm

d = 0.9 mm

i = 9 a                                          

write an expression for the number of turns, n, in the solenoid. you do not need to take into account the diameter of the wire in this calculation.

calculate the number of turns, n, in the solenoid.

write an expression for the length of the solenoid (l2) in terms of the diameter of the hollow tube d.

calculate the length of the solenoid (l2)   in meters.

calculate the magnitude of the magnetic field at the center of the solenoid in teslas.

explanation:

i think the answer would be b

a) electrical > light, sound, and thermal< < < <

) the mechanical energy of the firefighter moving.< < < < a) electrical > light, sound, and thermal< < < <

c) both a and b.