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Asfd D.

Physics 102 Electricity and Magnetism

6 hours ago

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Mary A.

Physics 102 Electricity and Magnetism

11 hours ago

An x-ray tube houses a filament and a target material that act as a cathode and anode. The cathode and anode are separated by a distance of 4 cm with a potential difference of 99 kV that establishes a uniform electric field. Determine the magnitude of the force an electron would experience if located between the target material and the filament.

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Mary A.

Physics 102 Electricity and Magnetism

11 hours ago

A 0.3 k? resistor is connected to a battery. If 2.9├Ś1018 electrons pass by a single point in the wire within a time interval of 4.2 s, determine the voltage of the battery.

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Asfd D.

Physics 102 Electricity and Magnetism

1 day, 1 hour ago

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Bismark K.

Physics 102 Electricity and Magnetism

1 day, 3 hours ago

The same potential difference is applied to two light bulbs, 60W and 30W connected together in parallel. Which one of the following statements is true?

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Bismark K.

Physics 102 Electricity and Magnetism

1 day, 3 hours ago

The current through a flashlight bulb is 0.180 A. How many electrons flow through the bulb each second? (a) 9.360 ├Ś 1017 (b) 8.889├Ś 10-19 (c) 2.880 ├Ś 10-18 (d) 1.125 ├Ś 1018

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Bismark K.

Physics 102 Electricity and Magnetism

1 day, 3 hours ago

2. To prevent injury at home, the important electrical quantity to control is

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Bismark K.

Physics 102 Electricity and Magnetism

1 day, 3 hours ago

1. When terminals of an ammeter is connected to two points of a resistor at different potentials in a circuit:

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Bismark K.

Physics 102 Electricity and Magnetism

1 day, 3 hours ago

16. In a given accelerator, a current of 1.0 mA is carried by a 6-Mev proton beam that has a radius of 2.0 mm.

BK

Bismark K.

Physics 102 Electricity and Magnetism

1 day, 3 hours ago

15. A small but measurable current of 1.2 x 10-10 A exists in a copper wire whose diameter is 2.5 mm. Assuming the current is uniform, calculate: (a) the current density and (b) the electron drift speed.

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14_Amita P.

Physics 102 Electricity and Magnetism

1 day, 13 hours ago

Question no. 13

KT

Kathryn T.

Physics 102 Electricity and Magnetism

2 days, 2 hours ago

You have to hold a book $55 \mathrm{cm}$ from your eyes for the print to be in focus. What power lens would correct your farsightedness?

PW

Patricia W.

Physics 102 Electricity and Magnetism

2 days, 2 hours ago

A meter stick lies on the bottom of the rectangular tank in Fig. $30.20,$ with its zero mark at the tank's left edge. You look into the long dimension of the tank at a $45^{\circ}$ angle, with your line of sight just grazing the top edge, as shown. What mark on the meter stick do you see when the tank is (a) empty, (b) half full of water, and (c) full of water? (FIGURE CANNOT COPY)

EC

Edu C.

Physics 102 Electricity and Magnetism

2 days, 2 hours ago

A thin rod lies on the $x$ -axis between $x=0$ and $x=L$ and carries total charge $Q$ distributed uniformly over its length. Show that the electric field strength for $x>L$ is given by $E=k Q /[x(x-L)]$

AG

Austin G.

Physics 102 Electricity and Magnetism

2 days, 2 hours ago

The index of refraction for red light in water is 1.331 and that for blue light is 1.340 . If a ray of white light enters the water at an angle of incidence of $83.00^{\circ},$ what are the underwater angles of refraction for the (a) blue and (b) red components of the light?

SH

Stephanie H.

Physics 102 Electricity and Magnetism

2 days, 2 hours ago

What is different about the magnetic poles of common refrigerator magnets and those of common bar magnets?

JS

James S.

Physics 102 Electricity and Magnetism

2 days, 2 hours ago

A beam of electrons whose kinetic energy is $K$ emerges from a thin-foil "window" at the end of an accelerator tube. A metal plate at distance $d$ from this window is perpendicular to the direction of the emerging bcam (Fig, $28-53 )$ . (a) Show that we can prevent the beam from hitting the plate if we apply a uniform magnetic ficld such that $$B \geqq \sqrt{\frac{2 m K}{e^{2} d^{2}}}$$ $$ \begin{array}{l}{\text { in which } m \text { and } e \text { are the electron mass and charge. (b) How should }} \\ {\vec{B} \text { be oriented? }}\end{array}$$

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Alex T.

Physics 102 Electricity and Magnetism

2 days, 2 hours ago

A solid copper sphere whose radius is 1.0 $\mathrm{cm}$ has a very thin surface coating of nickel. Some of the nickel atoms are radioactive, each atom emitting an electron as it decays. Half of these electrons enter the copper sphere, each depositing 100 $\mathrm{keV}$ of energy there. The other half of the electrons escape, each carrying away a charge $-e$ The nickel coating has an activity of $3.70 \times 10^{8}$ radioactive decays per second. The sphere is hung from a long, non-conducting string and isolated from its surroundings.(a) How long will it take for the potential of the sphere to increase by 1000 $\mathrm{V} ?$ (b) How long will it take for the temperature of the sphere to increase by 5.0 $\mathrm{K}$ due to the energy deposited by the electrons? The heat capacity of the sphere is 14 J/K.

SA

Stefanie A.

Physics 102 Electricity and Magnetism

2 days, 2 hours ago

An electron is released from rest on the axis of an electric dipole that has charge $e$ and charge separation $d=20 \mathrm{pm}$ and that is fixed in place. The release point is on the positive side of the dipole, at distance 7.0$d$ from the dipole center. What is the electron's speed when it reaches a point 5.0$d$ from the dipole center?

CF

Carol F.

Physics 102 Electricity and Magnetism

2 days, 2 hours ago

Figure $25-48$ shows a parallel-plate ca- pacitor with a plate area $A=7.89 \mathrm{cm}^{2}$ and plate separation $d=4.62 \mathrm{mm}$ . The top half of the gap is filled with material of dielectric constant $\kappa_{1}=11.0 ;$ the bottom half is filled with material of dielectric constant $\kappa_{2}=12.0 .$ What is the capacitance?

PP

Patrick P.

Physics 102 Electricity and Magnetism

2 days, 2 hours ago

What is the magnitude of the electrostatic force between a singly charged sodium ion $\left(\mathrm{Na}^{+},$ of charge $+e\right)$ and an adjacent singly charged chlorine ion $\left(\mathrm{Cl}^{-},$ of charge $-e\right)$ in a salt crystal if their separation is $2.82 \times 10^{-10} \mathrm{m} ?$

PS

Patrick S.

Physics 102 Electricity and Magnetism

2 days, 2 hours ago

(1I) A long uniformly charged thread (linear charge density $\lambda = 2.5 \mathrm { C } / \mathrm { m } )$ lies along the $x$ axis in Fig. $56 .$ A small charged sphere $( Q = - 2.0 \mathrm { C } )$ is at the point $x = 0 \mathrm { cm } , y = - 5.0 \mathrm { cm } .$ What is the electric field at the point $x = 7.0 \mathrm { cm } , \quad y = 7.0 \mathrm { cm } ?$ $\vec { \mathbf { E } } _ { \text { thread } }$ and $\mathbf { \mathbf { E } } _ { \mathrm { O } }$ represent fields due to the long thread and the charge $Q ,$ respectively.

DF

Dawn F.

Physics 102 Electricity and Magnetism

2 days, 2 hours ago

The electric field at the surface of a charged, solid, copper sphere with radius 0.200 m is 3800 N$/$C, directed toward the center of the sphere. What is the potential at the center of the sphere, if we take the potential to be zero infinitely far from the sphere?

DF

Dawn F.

Physics 102 Electricity and Magnetism

2 days, 2 hours ago

At a certain distance from a point charge, the potential and electric-field magnitude due to that charge are 4.98 V and 16.2 V$/$m, respectively. (Take $V = 0$ at infinity.) (a) What is the distance to the point charge? (b) What is the magnitude of the charge? (c) Is the electric field directed toward or away from the point charge?

CR

Charles R.

Physics 102 Electricity and Magnetism

2 days, 2 hours ago

A very large, horizontal, nonconducting sheet of charge has uniform charge per unit area $\sigma =$ 5.00 $\times$ 10$^{-6}$ C/m$^2$. (a) A small sphere of mass $m =$ 8.00 $\times$ 10$^{-6}$ kg and charge $q$ is placed 3.00 cm above the sheet of charge and then released from rest. (a) If the sphere is to remain motionless when it is released, what must be the value of $q$? (b) What is $q$ if the sphere is released 1.50 cm above the sheet?

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