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Readme [11.4K]
3 years ago
13

Help me please i dont understand

Physics
1 answer:
alexandr402 [8]3 years ago
5 0
Option A is the correct answer.
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3 years ago
harge of uniform density (100 nC/m3) is distributed throughout a hollow cylindrical region formed by two coaxial cylindrical sur
Elden [556K]

Answer:

The magnitude of the electric field is 8.47 N/C

Explanation:

Given;

uniform charge density, λ = 100 nC/m³

inner radii of the cylinder, r =  1.0 mm and 3.0 mm

distance from the symmetry axis, R = 2.0 mm

Volume =\pi (R^2 -r^2)l\\\\Volume =\pi ((2*10^{-3})^2 -(1*10^{-3})^2)l\\\\Volume =\pi (4*10^{-6} - 1*10^{-6})l\\\\Volume = 3*10^{-6} \pi l \ m^3

Area = 2πrl

Area =2π(2 x 10⁻)l

Volume = A x d

d = Volume / Area

d = \frac{V}{A} = \frac{3*10^{-6}*\pi*l}{4\pi *10^{-3} l} = 75 *10^{-5} \ m

the magnitude of the electric field

E = \frac{\lambda *d}{\epsilon_o} = \frac{100*10^{-9} *75*10^{-5}}{8.854*10^{-12}} \\\\E = 8.47 \ N/C

Therefore, the magnitude of the electric field is 8.47 N/C

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3 years ago
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An object is placed 250 cm in front of a concave circular mirror, and the image of the object also appears at 250 cm in front of
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Answer:

Radius of curvature of the mirror = 250 cm

Explanation:

Given:

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Computation:

Using mirror formula

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1/f = 1/(-250) + 1/(-250)

f = (-250/2)

f = -125 cm or 125 cm

Radius of curvature of the mirror = 2(f)

Radius of curvature of the mirror = 2(125)

Radius of curvature of the mirror = 250 cm

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