Two wires, each having a weight per unit length of 1.0 × 10^-4 N/m, are strung parallel, one 0.10 m above the other. If the wires carry the same current, though in opposite directions, how great must the current in each wire be for the magnetic field of the lower conductor to balance the weight of the upper conductor?
7.1 A
You might also like to view...
What is a meteorite?
A. any one of the large, rocky bodies that orbit the Sun, primarily between Jupiter and Saturn B. the object that causes a "shooting star," but before it passes through the atmosphere C. a space rock that survives its fall through Earth's atmosphere and reaches the ground D. a glowing trail of hot gas and debris heated by friction as an object moves through the atmosphere
A straight 10-cm wire bent at its midpoint so as to form an angle of 90° carries a current of 10 A. It lies in the xy plane in a region where the magnetic field is in the positive z direction and has a constant magnitude of 3.0 mT. What is the magnitude of the magnetic force on this wire?
a. 3.2 mN b. 2.1 mN c. 5.3 mN d. 4.2 mN e. 6.0 mN
What is the overall result of the proton—proton chain?
A) 4 H becomes 1 He + energy. B) 6 H becomes 1 He + energy. C) p + p becomes 1 deuterium nucleus (2H) + energy. D) Individual protons are joined into long chains of protons.
The secondary coil of an ideal neon sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What current does the primary draw?
A) 0.625 A B) 0.625 mA C) 0.160 A D) 1.66 A