Magnetism169At point C, ( )1202228IaTBBµπµ===while 30240BIaTπ1and B(2B. These contributions are oriented as shown in Figure 4. Observe that the horizontal components of GGcancel while their vertical components add to oppose B. The magnitude of the resultant field at C is 3G)()12sin 45T sin 45B=+=°356T= 0CBµµ−40°−19.64 (a) Since one wire repels the other, the currents must be in opposite directions . (b) Consider a free body diagram of one of the wires as shown at the right. or 0 cos8.0yFTΣ=⇒°=mgcos8.0mgT=°0 FF(sin8.0sin8.0cos8.0xmmgT=°=°°or
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