A velocity selector uses a fixed electric field of magnitude E and the magnetic field is varied to select particles of various energies. If a magnetic field of magnitude B is used to select a particle of a certain energy and mass, what magnitude of magnetic field is needed to select a particle of equal mass but twice the energy?
a. 0.50 B
b. 1.4 B
c. 2.0 B
d. 0.71 B
e. 1.7 B
d
You might also like to view...
The Large and Small Magellanic clouds are satellites galaxies of the Milky Way
Indicate whether the statement is true or false
Consider a situation where you carry a 20 N box up a flight of stairs, raising its elevation by 5 m. The increase of potential energy of the box is
a. 0 c. 100 J b. 4 J d. none of the above
Charge in an Electric Field: A proton is placed in an electric field of intensity 800 N/C. What are the magnitude and direction of the acceleration of the proton due to this field? (e = 1.60 × 10-19 C, mproton = 1.67 × 10-27 kg)
A. 7.66 × 109 m/s2 opposite to the electric field B. 7.66 × 1010 m/s2 opposite to the electric field C. 7.66 × 1010 m/s2 in the direction of the electric field D. 76.6 × 1010 m/s2 opposite to the electric field E. 76.6 × 1010 m/s2 in the direction of the electric field
Which of the following best describes a breadcrumb trail?
A. A hidden menu that expands when a visitor points to or clicks on it. B. A menu that drops down to display subcategories when the visitor points to or clicks on it. C. An index of pages on a website, presented on a separate site map page. D. A hierarchical outline or horizontal list that shows the path from the home page to the currently viewed page.