STATIC ELECTRICITY

An atom is positively charged because it . . . .

• receives one or more neutrons

• receives a proton (positive) from another atom

• loses one or more electrons

• loses one or more neutrons

Experiment procedures:

(1)      Rubber rods are electrically charged

(2)      Glass rods are electrically charged

(3)      A charged glass rod is brought near a charged rubber rod

(4)      Two rubber rods are brought close together, two glass rods are brought close together

A conclusion drawn from this experiment is . . . .

• the rubber rod is positively charged; the glass rod is negatively charged

• different types of charges attract each other

• the glass and rubber rods repel each other

• electric charges can move from one object to another

If a dry plastic rod is rubbed with woolen cloth, the plastic rod becomes charged. When this plastic rod is brought near a charged glass rod, they exert forces on each other that pull them together. The phenomenon above occurs because the . . . .

• proton moves from the plastic rod to the woolen cloth

• electron moves from the woolen cloth to the plastic rod

• electron moves from the plastic to the glass rod

• proton moves from the glass to the plastic rod

The constant (k) which was determined by Coulomb in Coulomb’s law is . . . .

• 1 N.C²/m²

• 1 dyne.stc²/cm²

• 9.0 x 10⁹ dyne.cm²/stc²

• 9.0 x 10⁹ Nm²/C²

Two electrically charged objects which are brought close to each other will produce a force. According to Coulomb, this force is . . . .

• proportional to the square of the distance between them

• inversely proportional to the electric charges of both objects

• proportional to the electric charges of both objects

• inversely proportional to the distance between them

Two charged objects with +10 C and -8 C are placed 2 meters apart. The force produced by those objects’ charge is . . . .

• 5 N

• 2 N

• 4.5 x 10¹⁰ N

• 1.8 x 10¹¹ N

The atomic particle that cause a neutral atom to be transformed into an ion (electric charge atom) is a/an . . . .

• proton

• electron

• neutron

• nucleon

If a rubber rod repels a pith ball, what can be deduced about the charges on the rubber rod and the pith ball?

• Only the rod is charged

• Only the pith ball is charged

• Either the rod or the pith ball is charged, but not both

• Both the rod and pith ball carry like charges

The figure represents 5 charged balls. Ball B and E are negatively charged ( - ). When ball A is brought near to ball E, they repel each other, but when it is placed next to D, they attract each other. When ball C is brought near to E, they attract each other.

Based on the phenomena, we can conclude that . . . .

• ball A is negatively charged, while C and D are positively charged

• ball A is positively charged, while C and D are negatively charged

• ball A and C are negatively charged, while ball D is positively charged

• ball A and D are negatively charged, while ball C is positively charged

Which of the following figure shows a correct electrical induction?

• 
• 
• 
•