Yes It is all metal is a good heat conductor
Explanation:
2) C would need the least effort, because the longer the effort distance, the least the effort applied.
Answer:

Explanation:
F = Magnetic force = 0.018 N
B = Magnetic field = 0.03 T
L = Length of wire = 35 cm
= Angle between current and magnetic field = 
Magnetic force is given by

The magnitude of the current is
.
Wavelength = (speed) / (frequency)
Wavelength = (320 m/s) / (300 / sec)
Wavelength = (1 and 1/15) m/s