# Malaysia SPM Form 5 Physics - Electricity

1.1 Electric Charge
1.2 Electric Current
1.3 Potential Difference
1.4 Ohm's Law & Resistance
2.1 Circuit - Resistance
2.2 Circuit - Current
2.3Circuit - Potential Difference
3.1 Electromotive Force (E.M.F.)
4.1 Electrical Energy and Power

# Electric Charge and Field

The SPM Physics Workbook is developed under the One-School.net Free Books Project. The content of this book is strictly follow Malaysia SPM (Sijil Pelajaran Malaysia) syllabus. The aim of this project is to provide a complete electronic supplementary network for students to develop self-learning skills by breaking the spoon-feed rituals and to encourage them to compile educational information from the Internet.
1) 1.25 ×1019 electrons are added into an object. Calculate the nett charge of the object in the unit of Coulomb. (Charge of 1 electron = -1.6 ×10-19C)

 2C -2C 1.5C -1.5C

2) 1.25 ×1019 electrons are removed from an object which initially has net charge of +3C. Find the FINAL nett charge of the object.
(Charge of 1 electron = -1.6 ×10-19C)

 -2C +2C +5C +1C

3) The charge of an electron is -1.6×10-19C. How many electrons are there in -3 Coulomb of charge?

 1.875 ×1019 6.025 ×1019 1.250 ×1019

4) The charge of a sphere is +2C. Which of the followings is true regarding the sphere?

 There are no electrons in the sphere. There are 1.25 ×1019 protons more than electrons in the sphere. There are 1.25 ×1019 protons in the sphere.

5) In the figure above, which picture shows the correct field pattern of the electric field around charged objects?

 Q only P, Q and R only R and S only Q and S only

6) In the figure above, which picture shows the correct field pattern of the electric field around charged objects?

 Q and S only P and Q only P, Q and S only P, Q, R and S

7) The SI unit for electric charge is
I. Ampere
II. Ampere second
III. Coulomb

 I only III only I and III only II and III only

8) Which of the figure among P, Q, R and S shows the correct observation of a candle flame in an electric field?

 P Q R S

9) The figure shows a ping pong ball coated with a layer of conductor touching a positive plate. What can be observed when the ping pong ball is released?

 The ping pong ball stick on the positive plate. The ping pong ball is pushed to the negative plate and stick on the negative plate. The ping pong ball oscillates between the positive and the negative plate.