Holooly Plus Logo
Holooly Plus Logo

Question 26.75: A certain x-ray tube operates at a current of 7.00 mA and a ......

A certain x-ray tube operates at a current of 7.00 mA and a potential difference of 80.0 kV. What is its power in watts?

Step-by-Step
The 'Blue Check Mark' means that this solution was answered by an expert.
Learn more on how do we answer questions.
Report Answer

The power dissipated is given by the product of the current and the potential difference:

P=i V=\left(7.0 \times 10^{-3} \,A \right)\left(80 \times 10^3\, V \right)=560 \,W .

Related Answered Questions

Question: 26.11

What is the current in a wire of radius R = 3.40 mm if the magnitude of the current density is given by (a) Ja = J0r/R and (b) Jb = J0(1 – r/R), in which r is the radial distance and J0 = 5.50 × 10^4 A/m²? (c) Which function maximizes the current density near the wire’s surface? ...

Verified Answer:

(a) The current resulting from this non-uniform cu...
Question: 26.10

The magnitude J of the current density in a certain lab wire with a circular cross section of radius R = 2.00 mm is given by J = (3.00 × 10^8)r², with J in amperes per square meter and radial distance r in meters. What is the current through the outer section bounded by r = 0.900R and r = R? ...

Verified Answer:

Assuming \vec{J} is directed alon...
Question: 26.9

The magnitude J(r) of the current density in a certain cylindrical wire is given as a function of radial distance from the center of the wire’s cross section as J(r) = Br, where r is in meters, J is in amperes per square meter, and B = 2.00 × 10^5 A/m³.This function applies out to the wire’s radius ...

Verified Answer:

We note that the radial width Δr = 10 μm is small ...
Question: 26.8

A small but measurable current of 1.2 × 10^-10 A exists in a copper wire whose diameter is 2.5 mm. The number of charge carriers per unit volume is 8.49 × 10^28 m^-3. Assuming the current is uniform, calculate the (a) current density and (b) electron drift speed. ...

Verified Answer:

(a) The magnitude of the current density vector is...
Question: 26.7

A fuse in an electric circuit is a wire that is designed to melt, and thereby open the circuit, if the current exceeds a predetermined value. Suppose that the material to be used in a fuse melts when the current density rises to 440 A/cm². What diameter of cylindrical wire should be used to make a ...

Verified Answer:

The cross-sectional area of wire is given by A = π...
Question: 26.6

A certain cylindrical wire carries current. We draw a circle of radius r around its central axis in Fig. 26-24a to determine the current i within the circle. Figure 26-24b shows current i as a function of r².The vertical scale is set by is = 4.0 mA, and the horizontal scale is set by r²s = 4.0 mm². ...

Verified Answer:

(a) Circular area depends, of course, on r², so th...
Question: 26.3

A charged belt, 50 cm wide, travels at 30 m/s between a source of charge and a sphere. The belt carries charge into the sphere at a rate corresponding to 100 μA. Compute the surface charge density on the belt. ...

Verified Answer:

We adapt the discussion in the text to a moving tw...
Question: 26.2

An isolated conducting sphere has a 10 cm radius. One wire carries a current of 1.000 002 0 A into it. Another wire carries a current of 1.000 000 0 A out of it. How long would it take for the sphere to increase in potential by 1000 V? ...

Verified Answer:

Suppose the charge on the sphere increases by Δq i...
Question: 26.1

During the 4.0 min a 5.0 A current is set up in a wire, how many (a) coulombs and (b) electrons pass through any cross section across the wire’s width? ...

Verified Answer:

(a) The charge that passes through any cross secti...
Question: 26.26

In Fig. 26-26a, a 9.00 V battery is connected to a resistive strip that consists of three sections with the same cross-sectional areas but different conductivities. Figure 26-26b gives the electric potential V(x) versus position x along the strip. The horizontal scale is set by xs = 8.00 mm. Section ...

Verified Answer:

The absolute values of the slopes (for the straigh...