Name Fourth Test, Page 4 of 7 Dec 1, 2017 A velocity selector is a device that a

Question

Name Fourth Test, Page 4 of 7 Dec 1, 2017 A velocity selector is a device that allows charged particles with a specific speed to cross unaffected, while deflecting others with different speeds. It is built by haing a region with perpendicular electric and magnetic fields, perpendicular in turn to the trajectory of the ions. 7. (10 points) The electric field on the selector is set to E 20.0N/C: The magnitude of the magnetic field required to select a speed of 1.00 × 104 m/s is A. 5.00/T B. 500T C. 20.0kT D. 20.0T E. 2.00mT

Explanation / Answer

qvB=qE

B=E/v = 20/ 1×104 = 2.0 mT

So value of magnetic field is 2 mT .

Option E is correct

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