Question

#10

Answer in units of T. 6. B = 12-3-k) 7. B = 120-k) 8. B = 120+k) 9. B =-; 10. B =- 007 (part 2 of 2) 10.0 points For given values of È and B, there exists a critical speed such that the electrons may move along the +a direction undeflected. If the speed of the electron is less than the criti- cal speed, along which direction will the elec trons be deflected? 1. = 30+) 009 (part 2 of 2) 10.0 points What is its direction? 1. Negative y direction 2. Positive y direction 3. Negative r direction 4. None of these 5. Positive r direction 6. Negative z direction 7. Positive z direction 010 10.0 points A conductor suspended by two flexible wires as in the figure has a mass per unit length of 0.98 kg/m. The acceleration of gravity is 9.8 m/s. 2. Vz1-3-4) 3. =) 4. = 5.0 = 156+2) < Bin 6.0 = 136-4 6 - 2) 7. 8. V6+) 9. = -6 10.0 = -j 008 (part 1 of 2) 10.0 points A 10 A current is directed along the posi- tive r-axis and perpendicularly to a uniform magnetic field. The conductor experiences a magnetic force per unit length of 0.19 N/m in the negative y direction. Calculate the magnitude of the magnetic field in the region through which the current passes What current must exist in the conductor in order for the tension in the supporting wires to be zero when the magnetic field is 1.6 T into the page? Answer in units of A. 011 10.0 points A current of 2.1 A flows in a straight wire segment of length (4 cm) i + (4 cm)in a uniform magnetic field of strength (2T)i. Find the magnitude of the force on the wire. Answer in units of N. 012 10.0 points Consider two straight wires each carrying our rent I, as shown.

Answer 1

HE Т. LL Gi •T I for the tension to be zero mg must be balanced by the magnetic force F. The current must be anticlockwise as mg shown, so the magnetie fonce oppose the ma mass furit length fornce due to gravity, Let, the current be i Tunce unit length dire to current i and magnetic field B is, FriB per 50 so. Fumg iB = mg => i = mg 0 9 8 X 9'8 = 690025 Amperes B 1.6 ~ 6 Ampere. :. current must be must be 6 Amperes. -