1. What is the heating effect of electric current?
2. Write any three uses of electromagnets?
3. Explain the working of electric fuse.
4. State the characteristic of image formed by a plane mirror.
5. What is rectilinear propagation of light?
6. Explain with the help of activity that seven colours of light can be combined to produced white light.
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Answers
Answer:
1. The reason behind the heating effect of electric current is when the current passes through a conductor the electrons have to face the resistance of the conductor which results in the loss of energy and this loss of energy gets converted into heat energy.
2. Electromagnets are widely used as components of other electrical devices, such as motors, generators, electromechanical solenoids, relays, loudspeakers, hard disks, MRI machines, scientific instruments, and magnetic separation equipment.
3. An electric fuse is an electric device which interrupts the flow of current in an electric circuit. ... A fuse is usually a short piece of wire. The fuse is made up of a material which has high resistivity and low melting point, so that it melts down due to overheating of the wire during high current flow.
5. Rectilinear propagation describes the tendency of Electromagnetic waves (light) to travel in a straight line. Light only deviates from a straight line when the medium it is travelling through changes density. This is called refraction.