Question
f. D www physcsp due edu-jeres 105 phys 21900 Fal2015, DOC1026 15-10263 4. Two very long straight wines ane oriented as shown in the figure to the right. They carry cursenns of le and Zleas shawn in the diagram. If the carrent in cach wire is doubied, the magnetic field al point P a) will inceease by a facter of twe b) will dacrease by a factor of two c) will increase by a fastor of six d) will dearease by a factor of sx e) will remain the sarre "p 21, S. A pieve of wire is best to forn a cincuiar loop of adus is shown in te diagram if 10 A of ement flows deckwise (CW) theough the loop, the magnetic field a cw he magsetic field a geeneng eester of the loop (marked by the "X") will be
Explanation / Answer
magnetic field B = uoi/2pi R
if I1 doubles, B1 Doubles
if I2 dobles, B2 also Doubles
so Bnet at P also doubles
so option D it is correct
