Terminology for Electrostatics (write Neat Please) The two basic principles behi

Question

Terminology for Electrostatics (write Neat Please)

The two basic principles behind static electricity that you experienced in the sticky-tape exploratory lab are

Like charges repel

Unlike charges attract

There are two types of charges, namely

negative charges: the smallest negative charge is on the electron

positive charges: the smallest positive charge is on the proton

The charge on the proton and the charge on the electron are the same in magnitude, but they have opposite signs. A neutral object has the same amount of positive charges as it has of negative charges.

Objects can acquire static charges through friction (rubbing the balloon against a sweater) or manual separation (in the sticky-tape portion of the lab). Either case results in an object that is no longer charge neutral, but has either lost some electrons and is therefore positively charged or gained some electrons and is therefore negatively charged.

When you take an electrostatically charged balloon and place it near a wall it will be attracted to the wall, although the wall is not charged. However, the molecules in the paint orient themselves in the following manner

The phenomenon where the object rearranges its charges but remains overall charge neutral is called charging by induction.

Conductors, Insulators, and More

When something bridges the distance between a charged object and a neutral object, there are two things that can happen as shown in the figure:

The insulator does not allow the negative charges to flow from the charged object to the initially uncharged object.
The conductor does allow the negative charges to flow from the charged object to the initially uncharged object.

Answer questions 13,14,16,17 Show your work (all calculations)

Q13. Find out which materials are good conductors and describe two of these materials and their applications here.

Q14. Find out what the term semiconductor means and explain it. Find out which materials are semiconductors and describe two of these materials and their applications here.

Q16. What are the units for the following electric quantities: voltage, current, and resistance.

Q17. If you connect a resistor with a resistance of 10 Ohm to a 1.5-V battery, what will the current be that is flowing through this resistor? Show your calculation.

Explanation / Answer

13] Copper and aluminium are two materials which are good conductor of electricity.

Both are used to conduct electricity from powerhouses to our homes. They are also used in electronic appliances.

14] Those substances which conduct electricity under certain condition and behave like insulators in other conditions. Example- silicon,selenium.

These semiconductors are widely used in making diodes and transistor. They are widely used in electronic industry.

16] Voltage - Volt (V)

current - Ampere (A)

Resistance - Ohm

17] Current = voltage/resistance

=1.5/10

= 0.15 A answer

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