(a) A DC power line for a light-rail system carries 1000 A at an angle of 30.0° to the Earth's 5.00 × 10-5-T field. What is the force on a 100-m section of this line?
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- A charge moves in a circle in a magnetic field at 12 m/s. If the 2 x10−5 T fieldpoints out of the page and the circle is clockwise with a radius of 5 cm, is the chargepositive or negative?If the absolute value of the charge is 3 C, find the magnitude of the force pushing on it.How far from the starter cable of a car, carrying 145 A, must you be to experience a field less than the Earth's (4.90*10^-5 T)? Assume a long, straight wire carries the current. (In practice, the body of your car shields the dashboard compass.)A magnetic dipole is under the influence of two magnetic fields. The angle between the field directions is 60°, and one of the fields has a magnitude of 1.2 × 10-2 T. If the dipole comes to stable equilibrium at an angle of 15° with this field, what is the magnitude of the other field?
- A proton traveling at 24.7° with respect to the direction of a magnetic field of strength 2.33 mT experiences a magnetic force of 6.38 × 10-17 N. Calculate (a) the proton's speed and (b) its kinetic energy in electron-volts.A proton traveling at 26.4° with respect to the direction of a magnetic field of strength 2.15 mT experiences a magnetic force of 8.13 × 10-17 N. Calculate (a) the proton's speed and (b) its kinetic energy in electron-volts.