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Otrada [13]
2 years ago
8

Which statement is true about magnetic poles? Question 20 options: all magnets have two poles Any magnet can have two north pole

s. Any magnet has only one pole. Any magnet can have two south poles.
Physics
1 answer:
irga5000 [103]2 years ago
5 0

Every magnet consists of two poles one is the south pole other one is the north pole. All magnets have two poles. This statement is correct.

<h3>What are magnetic poles?</h3>

The area at either end of a magnet where the external magnetic field is strongest is known as a magnetic pole.

Every magnet consists of two poles one is the south pole other one is the north pole like poles attracts each other while unlike poles repel each other.

Hence option (a) is correct. All magnets have two poles.

To learn more about the magnetic poles refer to the link;

brainly.com/question/1377848

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Answer:

The voltage across a semiconductor bar is 0.068 V.

Explanation:

Given that,

Current = 0.17 A

Electron concentration n= 2.7\times10^{18}\ cm^{-3}

Electron mobility \mu=1000 cm^2/Vs

Length = 0.1 mm

Area = 500 μm²

We need to calculate the resistivity

Using formula of resistivity

\sigma=n\times q\times \mu

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\rho=\dfrac{1}{2.7\times10^{18}\times10^{6}\times1.6\times10^{-19}\times1000\times10^{-4}}

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R=\dfrac{2\times10^{-6}\times0.1\times10^{-3}}{500\times(10^{-6})^2}

R=0.4\ \Omega

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V= IR

Put the value into the formula

V=0.17\times0.4

V=0.068\ V

Hence, The voltage across a semiconductor bar is 0.068 V.

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Explanation:

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As its duplet is already complete and it has noble gas configuration , it is stable with 2 valence electrons.

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