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(a) A 1 kW room heater operates at 240V. Calculate the current in the wire from

Figure 2. If the active (direction out of the page) and neutral (direction into the page) wires are separated by a distance of 4 mm, calculate the magnetic flux density B at a point (P), 1 cm from the cable (Hint: Assume the wires are infinitely long and note that µ0 = 4π×10-7 H/m is the permeability in free space).  

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