Two concentric current loops lie in the same plane. the smaller loop has a radius of 3.0 cm and a current of 12 a. the bigger loop has a current of 20 a. the magnetic field at the center of the loops is found to be zero.
what is the radius of the bigger loop?

Two horses begin at rest. after a few seconds, horse a is traveling with a velocity of 10 m/s west, while horse b is traveling with a velocity of 13 m/s west. which horse had a greater acceleration? a. horse a because its change in velocity was greater than horse b's in the same time. b. horse b because its change in velocity was greater than horse a's in the same time. c. horse b because its change in velocity was the same as horse a's, but it took less time. d. both horses had the same acceleration.