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      Question

      A 4 cm wire carrying a current of 15 A is placed inside

      a solenoid perpendicular to its axis. The magnetic field inside the solenoid is given to be 0.27 T. What is the magnetic force on the wire?
      A 16.2 ร— 10^โˆ’2 N Correct Answer Incorrect Answer
      B 3.1 ร— 10^โˆ’3 N Correct Answer Incorrect Answer
      C 8.1 ร— 10^โˆ’2 N Correct Answer Incorrect Answer
      D 3.1 ร— 10^โˆ’5 N Correct Answer Incorrect Answer

      Solution

      i=15 A, l=4cm=0.04m, B=0.27T and ฮธ=90 โˆ˜ Magnetic force on a current carrying conductor is given by: โ†’F=i(โ†’lร—โ†’B)=ilBsinฮธ F=15ร—0.04ร—0.27ร—sin90 โˆ˜ F=16.2ร—10โˆ’2N

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