Answer: There is always small
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16.Difference between a Bar Magnet and a Solenoid
The bar magnet is a permanent magnet whereas a solenoid is an electromagnet ie, it acts like a magnet only when an electric current is passed through. ... The poles of the bar magnet are fixed whereas for a solenoid the poles can be altered.
17.When you press a doorbell button, you complete an electrical circuit that allows household electricity to flow through the doorbell's internal electromagnet. The magnetic field generated by the electromagnet is then used to power a mechanism that creates the doorbell sound. Doorbells are low-voltage devices.
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Horses are more closely related to dogs than earthworms
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The more DNA you share with an organism, the more closely related you are. This is because shared DNA implies a common ancestor.
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<u>There are two main types of electron microscope – the transmission EM (TEM) and the scanning EM (SEM).</u>