Two Parallel Straight Wires Are 7

question 25

Multiple Choice

Two parallel straight wires are 7.0 cm apart and 50 m long.Each one carries a 18-A current in the same direction.One wire is securely anchored,and the other is attached in the center to a movable cart.If the force needed to move the wire when it is not attached to the cart is negligible,with what magnitude force does the wire pull on the cart? (μ₀ = 4π × 10^-7 T ∙ m/A)

• A)46 mN
• B)37 mN
• C)66 mN
• D)93 mN

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