For item numbers 12 and 13: Material A attracts Material B. On the other hand,
Material C repels Material A. However Material D can attract any of the other materials.
12.If Material A is positively charge, which of the following is TRUE?
A. Material C is positively charged
C. Material D is uncharged
B. Material B is negatively charged
D. All of the above
13. If Material B is positively charged, which of the following is TRUE?
A. Material A is negatively charged
C. Material D is uncharged
B. Material C is negatively charged
D. All of the above
14. Material L has become positively chraged after rubbing it with Material M.
Which of the following statements is TRUE?
A. Material L lossess protons
C. Material M loses proton
B. Material L gains electrons
D. Material M gains electron
15. What is really meant when we say an appliance "uses up” electricity?
A. The current disappears.
B. The main power supply voltage is lowered.
C. The potential energy of electron is changed into another form.
D. Electrons are taken out of the circuit and put somewhere else.​