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andrew-mc [135]

3 years ago

15

Which of the following is a probable source of Earth’s magnetic field?

2 answers:

krok68 [10]3 years ago

6 0

<span>b) earths outer iron core

</span><span>A coil of wire that is carrying a current and produces a magnetic field is called a solenoid. So the correct option is option "B", in regards to the question given. The term solenoid was first invented by the famous French physicist named Andre-Marie Ampere. In the terms of a physicist, it indicates a coil that has a far greater lenth than the diameter and is wrapped around a core made of metal to create a uniform magnetic field. If a compass is brought near the wire through which current is passing, it will indicate the direction in which the current is flowing. </span>

IRINA_888 [86]3 years ago

4 0

The answer is B
It has small particles of iron witch iron is magnetic

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Perform the following operation and express the answer in scientific notation. 7.0x10^3x1.1x10^7

dimulka [17.4K]

Answer:

The answer is: $7.7\times10^{10}$

Explanation:

Scientific notation is of the kind: $a.bc\times10^{x}$

The given calculation:

$7.0\times10^{3}\times1.1\times10^{7}=(7\times1.1)\times10^{(3+7)}$

$=7.7\times10^{10}$

Therefore, the answer in scientific notation is: $7.7\times10^{10}$

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Explanation:

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2 years ago

The percent ionization of benzoic acid, 2.05 %, at a particular concentration is 25 °C. What was the concentration of benzoic ac

Mkey [24]

Answer : The concentration of benzoic acid in this solution was, 0.149 M

Explanation :

The balanced equilibrium reaction will be,

$C_6H_5COOH\rightleftharpoons C_6H_5COO^-+H^+$

initially conc. c 0 0

At eqm. c(1-α) cα cα

The expression for dissociation constant is:

$k_a=\frac{c\alpha\times c\alpha}{c(1-\alpha)}$

when α is very very small the, the expression will be,

$k_a=\frac{c^2\alpha^2}{c}=c\alpha^2$

Given:

α = 2.05 % = 0.0205

$K_a=6.3\times 10^{-5}$

Now put all the given values in this expression, we get:

$6.3\times 10^{-5}=c\times (0.0205)^2$

c = 0.149 M

Therefore, the concentration of benzoic acid in this solution was, 0.149 M

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2 years ago