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Alexxandr [17]
4 years ago
12

Students in an introductory physics lab are producing a region of uniform electric field by applying a voltage to two 20-cm-diam

eter aluminum plates separated by 2.3 cm. They connect the two plates to the two terminals of a high-voltage power supply and then gradually turn up the voltage. In such a situation, sparks start to fly when the field exceeds 3.0×10^6V/m. What is the highest voltage the students can use?
Physics
1 answer:
earnstyle [38]4 years ago
4 0

Answer:

69000 V

Explanation:

E = Electric field = 3\times 10^6\ V/m

d = Distance between plates = 2.3 cm

When we multiply the electric field strength and the distance between the plates of a capacitor we get the maximum voltage.

Maximum voltage is given by

V_m=Ed\\\Rightarrow V_m=3\times 10^6\times 2.3\times 10^{-2}\\\Rightarrow V_m=69000\ V

The highest voltage the students can use is 69000 V

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Given Information:  

Current = I = 28 A

distance between wires = r = 2.0 m

Required Information:  

Magnetic field = B = ?

Answer:  

B = 12x10⁻⁶ T

Step-by-step explanation:  

Biot-Savart Law is given by  

B = μ₀I/2πr

Where μ₀ is the permeability of free space, I is the current flowing through the wire and B is the magnitude of the magnetic field produced.  

We are asked to find the magnetic field midway between the wires so r/2 = 1

B = 4πx10⁻⁷*28/2π*1

B = 6x10⁻⁶ T

since the same amount of current flows in both wires therefore, equal amount of magnetic field will be produced in both wires

B = 2*6x10⁻⁶ T

B = 12x10⁻⁶ T

Therefore, the net magnetic field midway between the two wires is 12x10⁻⁶ T.

3 0
3 years ago
A solid cylinder with a radius of 10 cm and a mass of 3.0 kg is rotating about its center with anangular speed of 3.5 rad/s. Wha
Lynna [10]

Answer:

kE=0.0735 J

Explanation:

Given that

Radius ,R=10 cm = 0.1 m

Mass ,m= 3 kg

Angular speed ,ω = 3.5 rad/s

We know that moment of inertia for solid sphere given as

I=\dfrac{2}{5}mR^2

Kinetic energy

KE=\dfrac{1}{2}I\omega^2

Now by putting the values

KE=\dfrac{1}{2}\times \dfrac{2}{5}mR^2\times \omega^2

KE=\dfrac{1}{2}\times \dfrac{2}{5}\times 3\times 0.1^2\times 3.5^2\ J

kE=0.0735 J

Therefore the kinetic energy will be 0.0735 J

3 0
3 years ago
Huck Finn walks at a speed of 0.70 m/s across his raft (that is, he walks perpendicular to the raft’s motion relative to the sho
ZanzabumX [31]

Answer

given,

Hunk Finn speed,v_y= 0.7 m/s

Speed of river,v_x = 1.50 m/s

Assuming the speed of the river is in x-direction.

Speed of Hunk Finn to be in y-direction.

Hunk velocity relative to river =

x = \sqrt{v_y^2+v_x^2}

x = \sqrt{2.74}

x =1.66\ m/s

Speed of Hunk relative to river = 1.66 m/s

direction of the boat

\theta =tan^{-1}(\dfrac{v_y}{v_x})

\theta =tan^{-1}(\dfrac{0.7}{1.50})

\theta = 25.01^{\circ}

Hence, angle of the raft is 24.01°

6 0
4 years ago
Earth Atmosfear is uniqe amongst the planets and is able to support life because it contains a large amount of __?
kiruha [24]

Answer:

A

Explanation:

The abundance of oxygen in our atmosphere and the presence of liquid water on the surface of our planet makes our "Pale Blue Dot" stand out in contrast to the other planets in the solar system — a unique and fragile home for life.

3 0
2 years ago
An object is moving east, and its velocity changes from 66 mvs to 26 mvs in 10 seconds. Which describes the
STALIN [3.7K]

Answer:

negative acceleration of 4m/s²

Explanation:

Given parameters:

Initial velocity  = 66m/s

Final velocity = 26m/s

Time taken = 10s

Unknown:

Description of the acceleration  = ?

Solution:

Acceleration is the rate of change of velocity with time.

It is mathematically expressed as;

    acceleration  = \frac{v - u}{t}

v is the final velocity

u is the initial velocity

t is the time taken

  Now insert the parameters and solve;

    Acceleration  = \frac{26 - 66}{10}   = -4m/s²

So, we see a negative acceleration of 4m/s²

6 0
3 years ago
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