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# img049 - 77777 77777_A charged particle with mass m = 3.34...

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Unformatted text preview: 77777 77777 . _A charged particle with mass m = 3.34 - 10‘27kg and charge q = 1.6- 10-190, initially at rest, will be accelerated from west to east over a distance of 0.5m by an electric ﬁeld of 3kV/m. It then enters a region with a magnetic ﬁeld of 0.354T pointing from north-east to south-west. What is the cyclotron radius (in cm) of the motion of the particle in the ﬁeld? (1) 1.6 (2) 1.1 (3) 1.9 (4) 2.2 (5) 0.8 Marga particle with mass m = 5.01 - 10—27kg and charge q = 1.6- 10‘190, initially at rest, will be accelerated from t to east over a distance of 0.5m by an electric ﬁeld of 3kV/m. It then enters a region with a magnetic ﬁeld of 0.354T pointing from north-east to south-west. What is the cyclotron radius (in cm) of the motion of the particle in the ﬁeld? (1) 1.9 (2) 1.6 (3) 1.1 (4) 2.2 (5) 0.8 13. A voltage of U = 1.1V is applied to a straight copper wire with radius r = 2m such that the ﬂow from south-west to north-east. The earth magnetic ﬁeld at the location of the wire points from south to north and has a niagnitude B = 50pT. The resistivity of copper is p = 1.7 - 1049111. What is the magnitude of the force (in mN) on t e wire? @29 (2)55 (3)14 (4) 43 (5) 72 “voltage of U = 2.1V is applied to a straight copper wire with radius r = 2 m such that the electrons ﬂow from nth-west to north-east. The earth magnetic ﬁeld at the location of the wire points from south to north and has a magnitude B = 50nT. The resistivity of copper is p = 1.7 - 10‘30m. What is the magnitude of the force (in mN) on the wire? (1) 55 (2)29 (3) 14 (4) 43 (5) 72 . A voltage of U = 2.2V is applied to a straight copper wire with radius r = 1 m such that the electrons ﬂow from nth-west to north-east. The earth magnetic ﬁeld at the location of the wire points from south to north and has a magnitude B = 50pT. The resistivity of copper is p = 1.7- IO—BQm. What is the magnitude of the force (in mN) on the wire? (1) 14 (2) 55 (3) 29 (4) 43 (5) 72 16. Electrons in an electron beam have a velocity of v = 6 Lloﬁm/s ﬂying from west to east. They enter a region in which an electric N ﬁeld E = 10 V/m points upwards or out of the plane. What mag- WSE E netic ﬁeld (magnitude in T) is necessary to reduce the deﬂection - ® ® 5 of the electron beam to zero (ignore gravity)? ' 3,3, ........ 7 ® ® @166 - 10-6 (2) 3.33 - 10-6 (3) 8.33 . 10-7 (4) 1.66 - 10—3 (5) 3.33-10-5 . Electrons in an electron beam have a velocity of u = 3 - 10°m/s ’ fromwesttoeast. Theyenteraregioninwhichanelectric N ﬁeld E = 10 V/m points upwards or out of the plane. What mag— W SE netic ﬁeld (magnitude in T) is necessary to reduce the deﬂection - ® Q of the electron beam to zero (ignore gravity)? a»; .. ..... E7 ® ® (1) 3.33 - 10'6 (2) 1.66 - 10-6 (3) 3.33 - 1o—7 (4) 3.33 - 1o—8 (5) 8.33 . 10~6 ...
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