phy_4.1.1_electric charge 電荷 1

X、Y 和 Z 三個帶電的塑膠球以輕繩懸掛在半空。下列哪一項可能是塑膠球所帶的電荷？

X, Y and Z are charged plastic balls suspended by light strings. Which of the following combinations is possible?

• X: + Y: + Z: -

• X: + Y: - Z: -

• X: - Y: - Z: -

• X: - Y: - Z: +

醋酸酯棒經羊毛布摩擦後會帶正電。摩擦過程中，以下哪一種物質會在棒和羊毛布之間轉移？

An acetate rod becomes positively charged when rubbed with woollen cloth. Which of the following are transferred between the rod and the cloth during the rubbing?

• 電子 Electrons

• 質子 Protons

• 中子 Neutrons

• 原子核 Nucleus

中性物體中必定不含任何帶電粒子。

Neutral objects must contain no charged particles.

• T

• F

X 和 Y 是兩個相同的塑膠球。X 帶電，Y 則不帶電。下列哪幅圖最能表示兩個球的狀況？

X and Y are two identical plastic spheres. X carries a charge and Y is neutral. Which of the following diagrams best represents the situation of the spheres?

• 
• 
• 
• 

帶正電的醋酸酯棒吸住一些紙屑，以下哪一項敍述必定是不正確的？

A positively charged acetate rod attracts some paper scraps. Which of the following statements must be incorrect?

• 紙屑是中性的。

  The paper scraps are neutral.

• 紙屑帶正電。

  The paper scraps are positively charged.

• 紙屑帶負電。

  The paper scraps are negatively charged.

一支帶正電的棒正移近一個中性球體，但兩者沒有接觸。下列哪些敍述是正確的？

(1) 球體帶有淨電。

(2) 球體遠離棒的一邊出現感生正電荷。

(3) 棒和球體上的感生正電荷互相排斥。

A positively charged rod is moved near to a neutral sphere without touching it. Which of the following results will be obtained?

(1) The sphere carries a net charge.

(2) A positive charge is induced on the side of the sphere away from the rod.

(3) There is repulsion between the rod and the positive induced charge on the sphere.

• 只有 (1)

• 只有 (2)

• (1) and (3) only

• (2) and (3) only

接觸下列哪點能將帶電金屬球接地？

Which of the following positions can be touched to make the charged metal sphere become earthed?

• P

• Q

• R

• 以上皆是

  All of the above

P 和 Q 是兩個相同的球形導體。初時，P 帶有 8 x 10^–9 C 的淨電荷，而 Q 是中性的。P 和 Q 互相觸碰後，Q 帶有多少淨電荷？

P and Q are two identical conducting spheres. At first, P carries a net charge of 8 x 10^–9 C and Q is neutral. P and Q are then brought into contact. What is the net charge on Q?

• 2 x 10^–9 C

• 4 x 10^–9 C

• 8 x 10^–9 C

• 16 x 10^–9 C

帶正電的棒移近兩個互相接觸的中性金屬球 X 和 Y。然後再把棒移走，並分開兩個金屬球。現在每個金屬球各帶哪種淨電荷？

A positively charged rod is brought close to two neutral metal spheres X and Y which are in contact with each other.

The rod is removed and then the two spheres are separated. What kind of net charge is carried by each sphere now?

• X: -

  Y: -

• X: -

  Y: +

• X: -

  Y: 中性 neutral

• X: 中性 neutral

  Y: 中性 neutral