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3 years ago

When is an object magnetic?

Physics

1 answer:

Sliva [168]3 years ago

7 0

When it has a magnetic field

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If is the current density and is a vector element of area then the integral over an area represents:Group of answer choicesthe r

34kurt

Answer:

The average current density at the position of the area.

Explanation:

Current density is the vector whose magnitude is electric current in the cross sectional area. Current density is vector quantity which is measured in amperes. The average current density is dependent on the electric current flow. It has perpendicular direction of flow and scalar magnitude.

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3 years ago

A point charge Q is placed at the center of a conducting spherical shell (inner radius a, outer radius b). What is the electric

sp2606 [1]

Answer:

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

b)E=0

c) $E=\dfrac{Q}{\varepsilon _o\times 4\pi r^2}\ N/C$

Explanation:

Given that

A point charge Q is placed at the center of a conducting spherical shell .Due to this - Q charge will induce on the inner sphere surface and +Q will induce on the outer sphere surface .

a) r < a

At a radius r ,from gauss theorem

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

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

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

b) a < r < b

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

The total induce in this surface = - Q+ Q =0

$E.ds=\dfrac{0}{\varepsilon _o}$

E = 0

c) r > b

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

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

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

4 0

3 years ago

An avant-garde composer wants to use the Doppler effect in his new opera. As the soprano sings, he wants a large bat to fly towa

Brilliant_brown [7]

Answer:

18.94 m/s

Explanation:

The bat becomes the source of sound . Source is moving towards observer

apparent frequency = actual frequency x (V / V - V_s)

V is velocity of sound and V_s is velocity of source or bat.

apparent frequency / actual frequency = V / (V - V_s)

21 / 12 = 340 / (340 - V_s)

1.059(340 - V_s) = 340

340 x .059 = 1.059 V_s

V_s = 18.94 m/s

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4 years ago

#4#4#4vhvyvhvvuvgufygcyfy

Zigmanuir [339]

Unsaturated I'm pretty sure

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4 years ago

Which Period 2 element would you expect to have the highest electrical and

evablogger [386]

The answer is c nitrogen thx me later

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3 years ago