Question

(a)  A balloon is given a positive charge when when you rub it on your hair. This is because __ are transferred from __ to ___. The individual strands of your hair will (CHOOSE ONE FROM THE PAIR) attract/repel one another, while your hair and the balloon will (CHOOSE ONE FROM THE PAIR) attract/repel one another.

(b) If the charge on the balloon is + 3.0 * 10^ -6 C (+3 uC), what are the magnitude and sign of the charge on your hair?

(c) If the balloon is held 40 cm from your hair, what is the magnitude of the force on the balloon?

(d) What is the magnitude of the force on your hair?

Answer 1

A)HAIRS WILL REPEL AND BALLON AND HAIR ATTRACT(When two objects rub against each other it is likely that one will steal electrons from the other. (see triboelectricity) If you rub a balloonagainst your hair, the balloon will steal electrons from your hair. This leaves your hair positively charged and the balloon negatively charged AND WE KNOW THAT LIKE CHARGES ATTRACT AND UNLIKE CHARGES REPEL)

B)-3UC

C)=9*10^9 * 3*10^-6 *-3*10^-6/(40*10^-2)^2

=-0.50625N

0.50625N(OPP)

D)0.50625N(SINCE FORCE ACTING ON HAIR WILL OPPOSITE FORCE ACTING ON BALLON)