Please complete problems 1-9! Thank you so much! A balloon will stick to a woode

Question

Please complete problems 1-9! Thank you so much! A balloon will stick to a wooden wall if the balloon is charged A) negatively. B) positively. C) either positively or negatively. D) None of the above choices are correct. Three resistors, 1-ohm, 2-ohm, and 3- ohm are connected in parallel. If they were connected in series instead their equivalent resistance would be A) 7 times as great. B) 9 times as great. C) 11 times as great. D) 13 times as great. E) None of the above choices are correct. Compared to the huge force that attracts an iron tack to a strong magnet, the force that the tack exerts on the magnet is A) relatively small. B) equally huge. C) More information is needed. Which force field can increase a moving electron's speed? A) only an electric field B) only a magnetic field C) either an electric or magnetic field D) none of these Which force field can accelerate an electron, but never change its speed? A) electric field B) magnetic field C) both of these D) none of these Voltage can be induced in a wire by A) moving the wire near a magnet. B) moving a magnet near the wire. C) changing the current in a nearby wire. D) Choices A, B, and C are all true. E) None of the above choices are true. An electric motor is very similar to A) an electric generator. B) an automobile battery. C) a radio receiver. D) None of the above choices are correct. Disregarding the effects of friction, a cyclist will coast farther when a lamp powered by a wheel generator is A) of low wattage. B) of high wattage. C) burned out. D) none of these

Explanation / Answer

1.

The correct option is C.

Due to induction, an opposite charge will devlop on the wall and due to attraction the balloon will stick to it.

2.

The correct option is C.

When in parallel their equivalent is (1*2*3)/(1*2 + 1*3 + 2*3) = 6/11 and when in series their equivalent is 1+2+3 = 6. Hence later is 11 times greater than former.

3.

The correct option is B.

As electromagnetic force on first body by the second equals the electromagnetic force on the second body by the first.

4.

The correct option is A.

As magnetic force acts perpendicular to the direction of motion and hence can't change the magnitude of speed. It only changes the direction of motion.

5.

The correct option is C

As electric field can increase the speed while magnetic field can change the direction so both of them can accelearte the electron.

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