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Leni [432]
4 years ago
11

Pls help...

Biology
1 answer:
ruslelena [56]4 years ago
8 0

Answer:

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.

Explanation:

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Answer:

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Explanation:

The hydrophobic effect is the tendency of nonpolar substances to aggregate when placed in a watery medium. Water has a tendency to form a maximum number of hydrogen bonds with other water molecules or polar substances. When the nonpolar substances are present in water, the water molecule is not able to form the optimum number of hydrogen bonds.

The nonpolar substance orient themselves around the water molecule to allow the formation of hydrogen bonds. This orientation is energetically unfavorable as water molecules are present in a more organized pattern and have lesser entropy that the bulk water. This results in a hydrophobic effect wherein the nonpolar substances exclude water to increase the entropy of water.

4 0
3 years ago
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