The dimensions of the rectangular loop of wire in Figure P29.35 are (ell=400 mathrm{~mm}) and (w=120 mathrm{~mm}).

Question:

The dimensions of the rectangular loop of wire in Figure P29.35 are \(\ell=400 \mathrm{~mm}\) and \(w=120 \mathrm{~mm}\). The mass of the loop is \(10 \mathrm{~g}\), its resistance is \(5.0 \mathrm{~V} / \mathrm{A}\), and before entering the magnetic field shown the loop is moving at a constant speed \(v_{\mathrm{i}}\). The magnetic field magnitude is 5. 0 T, and the loop's area vector is parallel to the field direction. How many seconds after the leading edge of the loop enters the magnetic field is the loop's speed half its initial value? Ignore any friction effects.

Data from Figure P29.35

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