चिपको आदोलन क्या था? वह क्यों किया गया था तथा कहाँ शुरू हुआ? जानकारी प्राप्त कर लिखिए। (शब्द सीमा-150 शब्द)
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The radial magnetic field is applied to a moving coil galvanometer to produce a constant torque on the coil. It is applied to measure the relation between the current and the angle which is non-linear such that the current cannot be measured easily. With the help of the radial magnetic field, the angle between the plane of the coil and the magnetic field is maintained zero in all the orientation of the coil.
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plants grow in soil which do not contain sufficient nitrogen mineral. These plants (e.g. pitcher plant) are green and carry out photosynthesis to obtain a part of the food required by them. ... So, insectivorous or carnivorous plants feed on insects to obtain the nitrogen needed for their growth.
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