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Mamont248 [21]
3 years ago
7

If an object with charge -3 nC moves from a location that has a potential of -20 V to a location with a potential of -10 V, what

has happened to the potential energy of the system?
Physics
1 answer:
enot [183]3 years ago
8 0

The potential energy decreases.

<u />

<u>Explanation:</u>

Given-

Charge of the object, q = -3nC

Initial potential, Vi = -20V

Final potential, Vf = -10V

Potential energy, U = ?

We know,

Potential, V = U/q

initial potential energy = Viq

                                                        = -20V X -3nC

                                                        = 60 nJ

Final potential energy = Vfq

                                     = -10V X -3nC

                                     = 30nJ

We can see that the potential energy decreases as the object moves from initial to final position which means that the work is done against the electric field.

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The terminals of a 0.70 Vwatch battery are connected by a 80.0-m-long gold wire with a diameter of 0.200 mm What is the current
Molodets [167]

Answer:

I = 11.26 mA

Explanation:

given,

V = 0.7 V           length = 80 m

diameter   = 0.2 mm = 0.02 cm

radius = 0.01 × 10⁻² m

resistance = \dfarc{\rho l}{A}

ρ for gold wire = 2.44 × 10⁻⁸ ohm-m at 20 °C

A = cross sectional area = π r² = π (0.01 × 10⁻² )²

    = 31.4× 10⁻⁹ m²

resistance = \dfarc{2.44\times 10^{-8} \times 80}{31.4\times 10^{-9}}

R = 62.165 Ω

I = \dfrac{V}{R}

I = \dfrac{0.7}{62.165}

I = 11.26 mA

8 0
3 years ago
Calculate the wavelength of a photon of electromagnetic radiation with a frequency of 151.7 mhz
AlekseyPX

The wavelength of a photon of electromagnetic radiation with a frequency of 151.7 Mhz is 1.978 meter

According to the question

The frequency of a photon of electromagnetic radiation = 151.7 Mhz

By using the Formula of wavelength and frequency

λ = C/f

Where,

λ (Lambda) = Wavelength in meters

C = Speed of Light (c = 3x10⁸ m/s)

f = Frequency

Now, the wavelength of a photon of electromagnetic radiation with a frequency of 151.7 Mhz is  

1 Mhz = 1000000 Hz

151.7 Mhz = 151.7 * 10⁶ Hz

λ = C/f  

Substituting the value of C and f  

  λ =  \frac{3*10^{8} }{151.7 * 10^{6}  }

  λ = 1.978 meter

Hence,  the wavelength of a photon of electromagnetic radiation with a frequency of 151.7 Mhz is 1.978 meter

To know more about  wavelength and frequency here:

brainly.com/question/18651058

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5 0
2 years ago
What is the current in milliamperes produced by the solar cells of a pocket calculator through which 3.70 C of charge passes in
Kaylis [27]

Answer:

Current flowing in the cell will be equal to 0.1284 mA

Explanation:

We have given charge q = 3.70 C

And time through which charge is flowing = 8 hour

We know that 1 hour = 60 minutes, and 1 minute = 60 sec

So 1 hour = 60×60 = 3600 sec

So 8 hour = 8×3600 = 28800 sec

We know that current is rate time rate of flow of charge

So current i=\frac{q}{t}=\frac{3.70}{28800}=1.284\times 10^{-4}A=0.1284mA

So current flowing in the cell will be equal to 0.1284 mA

3 0
4 years ago
Can some one help me please and thanks
nataly862011 [7]

Answer:

The way in which objects exert forces on each other is described by Newton’s 3rd law of motion

Explanation:

Objects with mass exert forces on each other via the force of gravity. This force is proportional to the mass of the two interacting objects and is inversely proportional to the square of the distance between them. The factors G, M, and rare the same for all masses at the surface of the Earth.

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