3. An electron enters a uniform electric field perpendicular to the field lines. What is the magnitude of the magnetic field if the electric effect completely canceled? (C) zero (D) E/V (E) eEv (A) Ev (B) v/E 111 e 4. A horizontal thin wire has a mass m and length L. The wire carries a constant current I. What must be the magnitude of the magnetic field in order to cancel the gravitational force? (A) IL/mg (B) mg/IL (C) Ig/mL (D) Im/gL (E) Zero
3. An electron enters a uniform electric field perpendicular to the field lines. What is the magnitude of the magnetic field if the electric effect completely canceled? (C) zero (D) E/V (E) eEv (A) Ev (B) v/E 111 e 4. A horizontal thin wire has a mass m and length L. The wire carries a constant current I. What must be the magnitude of the magnetic field in order to cancel the gravitational force? (A) IL/mg (B) mg/IL (C) Ig/mL (D) Im/gL (E) Zero
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how do you answer number 3? this is a non graded practice worksheet
Transcribed Image Text:3. An electron enters a uniform electric field perpendicular to the field lines. What is the magnitude of the
magnetic field if the electric effect completely canceled?
(A) Ev (B) v/E
(C) zero (D) E/V
(E) eEv
-141-
e
4. A horizontal thin wire has a mass m and length L. The wire carries a constant current I. What must be the
magnitude of the magnetic field in order to cancel the gravitational force?
(A) IL/mg (B) mg/IL
(C) Ig/mL (D) Im/gL (E) Zero
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