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AnnZ [28]
3 years ago
5

Charge Q is distributed on a metallic sphere of radius a. What is the electric field at a point a distance r from the center of

the sphere? Consider both cases r > a and r < a.

Physics
1 answer:
KengaRu [80]3 years ago
8 0

Answer:

a)E= 0  

b) E=\dfrac{Q}{\varepsilon _o\times 4\pi a^2}\ N/C

Explanation:

Given that

Charge Q is distributed on a metallic sphere of radius a

a)r < a.

At a radius r ,from gauss theorem

E.ds=\dfrac{q_i}{\varepsilon _o}

But in the sphere there is no any charge inside the sphere so

E.ds=\dfrac{o}{\varepsilon _o}

E.ds = 0

E= 0

b) r > a

At a radius r ,from gauss theorem

E.ds=\dfrac{q_i}{\varepsilon _o}

E\times 4\pi a^2=\dfrac{Q}{\varepsilon _o}

E=\dfrac{Q}{\varepsilon _o\times 4\pi a^2}\ N/C

   

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Answer:

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What current is needed to generate the magnetic field strength of 5.0×10−5T at a point 1.5 cm from a long, straight wire? Expres
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3.7 A

Explanation:

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Magnesium is a highly flammable element which is easily combustible in the presence of oxygen:
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4 atoms

Explanation:

On the product side, we expect to find 4 atoms of the product.

    An atom is the smallest indivisible particle that takes part in a chemical reaction.

    An element is a distinct substance that cannot be split-up into simpler substances. Such substances consist of only one kind of atom.

    In this reaction we have:

       2 elements:             Mg                O

on the reactant side:

   We have two moles of Mg:   2 atoms of Mg

            1 mole of oxygen gas:   2 atoms of O

                             total atoms:    4 atoms

According to the law of conservation of matter "in a chemical reaction, matter is neither created nor destroyed".

We expect to find 4 atoms of products which is MgO on the product side.

              2Mg + O₂ →  2MgO + heat

Learn more:

Conservation of matter brainly.com/question/2190120

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3 years ago
Read 2 more answers
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