Magnetic Effects Of Current Question 231
Question: Three long, straight parallel wires carrying current, are arranged as shown in figure. The force experienced by a 25 cm length of wire C is [KCET 2005]
Options:
A) 10-3 N
B) 2.5 ´ 10-3 N
C) Zero
D) 1.5 ´ 10-3 N
Show Answer
Answer:
Correct Answer: C
Solution:
Force on wire C due to wire D $ F_{D}={{10}^{-7}}\times \frac{2\times 30\times 10}{2\times {{10}^{-2}}}\times 25\times {{10}^{-2}}=5\times {{10}^{-4}}N $ (towards right) Force on wire C due to wire G $ F_{G}={{10}^{-7}}\times \frac{2\times 20\times 10}{2\times {{10}^{-2}}}\times 25\times {{10}^{-2}}=5\times {{10}^{-4}}N $ (towards left)
Þ Net force on wire C is $ F_{net}=F_{D}-F_{G}=0 $
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