Q.17- Draw the magnetic field lines around a straight Current carrying conductor.
Q.18- Veins are thin walled and have valves, justify.
Q.19- Explain how ozone being a deadly poison can still perform an essential function fo
our environment
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Veins are thick walled to sustain the pressure produced by the blood
The ozone layer is harmful because it is a mixture of 3 oxygen atoms that make it highly reactive, which is not good for our body system, and it is necessary because it protects the earth's surface from the sun 's entry of UV rays that can damage us by causing skin burning and skin cancer.
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