what is magnetic field write its four characteristics 2. write four precautions while dealing with electrical appliances 3. what are life processes 4. what is olfactory indicator
Answers
1) Magnetic field refers to an area around a magnet or materials that behave like a magnet, where there is a force that will attract some metals towards it.
3)Life processes are the series of actions, such as movement, respiration, sensitivity, growth, reproduction, excretion and nutrition that are essential for a living being to sustain.
4)An Olfactory indicator is a substance whose smell varies depending on whether it is mixed with an acidic or basic solution.
1)Magnetic field: The area around a magnet where a magnetic force is experienced is called the magnetic field. It is a quantity that has both direction and magnitude, (i.e., Vector quantity).
Characteristics of magnetic field
• The tangent drawn to the magnetic field lines gives the direction of the magnetic field.
• The closeness or density of the field lines is directly proportional to the strength of the field.
• Magnetic field lines appear to emerge or start from the north pole and merge or terminate at the south pole.
• Inside the magnet, the direction of the magnetic field lines is from the south pole to the north pole.
• Magnetic field lines never intersect with each other.
• Magnetic field lines form a closed-loop.
2)
• Avoid contact with energized electrical circuits.
•Disconnect the power source before servicing or repairing electrical equipment
•When it is necessary to handle equipment that is plugged in, be sure hands are dry and, when possible, wear nonconductive gloves, protective clothes and shoes with insulated soles.
•Use only tools and equipment with non-conducting handles when working on electrical devices.
3)The processes which together perform the function of maintenance of 'life' are called as life processes. Nutrition, respiration, circulation, excretion are examples of essential life processes.
4)An Olfactory indicator is a substance whose smell varies depending on whether it is mixed with an acidic or basic solution.