Which of the following is NOT an example of how to make a temporary magnet 1.Rubbing the non magnetic material against a positive or negative charge

2.Rub non magnetized material with one pole of a strong magnet

3.placing the non magnetized material in a strong magnetic field

Liquid from a brewery fermentation contains 10% ethanol and 90% water. part of the fermentation product (50,000 kg/h) is pumped to a distillation column on the factory site. under current operating conditions, a distillate of 45% ethanol and 55% water is produced from the top of the column at a rate of one-tenth that of the feed. what is the composition of the waste "bottoms" from the still?