when combing you hair you scuff electrons from your hair onto the comb.is your hair then positively or negativley charged?How about the comb?

-Your hair is postively charged, while the comb is negatively charged

Why are the tires for trucks carrying gasoline and other flammable fluids manufactured to conduct electricity?
-This question I don't understand

2 answers

If the tires do not conduct electricity, the truck cannot acqure a charge with respect to the ground, and no sparks will happen between truck and ground.

Some trucks used to drag a short chain behind them, barely touching the ground, for the same reason.
Why are the tires for trucks carrying gasoline and other flammable fluids manufactured to conduct electricity?