In houston, earth's b→ field has a magnitude of 5.2 × 10−5 tand points in a direction 57∘ below a horizontal line pointing north. part adetermine the magnitude of the magnetic force exerted by the magnetic field on a 11-m-long vertical wire carrying a 11-a current straight upward. express your answer to two significant figures and include the appropriate units. part bdetermine the direction of the magnetic force. a. to the northb. to the eastc. to the southd. to the west