Electromagnetism

Question 6:Figure 5 shows a wooden block with a bar magnet tied to it sliding with an acceleration down a smooth track.When the block arrives at mark X on the track, the switch is turned on.(a) What is produced in the solenoid? Explain your answer.(b) Explain the motion of the block after the switch is … Read more

Question 3:Figures 2 and 3 show the induced currents produced when there is relative motion between a bar magnet and a solenoid.(a) What is the meaning of induced current?(b) Based on the direction of the current given in Figures 2 and 3, state the magnetic polarities at ends X and Y of the solenoid.(c) State … Read more

Question 1:Figure 1 shows a conductor hanging from a sensitive spring balance in between a pair of Magnadur magnets.(a) Suggest the polarity of dry cell X, Y and the polarity of magnets P, Q such that the reading of the spring balance increases when switch S is turned on.(b) Explain why the reading of the … Read more

Q: Why the voltage is stepped up before transmitting electricity over a long distance? A: Stepping up the voltage can reduce the current in the cable. This reduces the power loss in the cable during transmission. [This image is shared by its author Aatu Liimatta in Wikipedia Image. This file is licensed under the Creative … Read more

Wind Power[This image is shared by Wagner Christian. This file is licensed under the Creative Commons Attribution ShareAlike 2.5 License. ] Advantages The advantages of using wind as a source of energy to generate electricity are. It is renewable energy. It does not pollute the environment. It is suitable for the mountain area because the wind speed in the mountain … Read more

Biomass is biological material derived from living organisms such as wood and animal waste. As a renewable energy source, biomass can either be used directly via combustion to produce heat or indirectly after converting it to various forms of biofuel. Heat energy produced from the burning of biomass can be used to generate electricity. Advantages … Read more

Nuclear Power Advantages The advantages of using nuclear energy as a source of energy to generate electricity are. The nuclear fuel such as uranium and plutonium has high energy capacity. A small amount of uranium can produce a huge amount of energy. Nuclear energy does not pollute the air. Disadvantages The disadvantages of using nuclear … Read more

Solar power Advantages The advantages of using solar energy as a source of energy to generate electricity are. It is renewable energy. Sunlight is free and can be obtained easily. It does not pollute the air. Disadvantages The disadvantages of using solar energy as a source of energy are. A large area is needed to … Read more

Fossil Fuel. Advantages The advantages of using fossil fuel such as petroleum, natural gas and coal as a source of energy to generate electricity are. It is relatively easy to be collected as they are present in large amount in one place. It contains high energy capacity. Disadvantages The disadvantages of using fossil fuel as … Read more