A long straight wire Wire 1 carries a current such that a magnetic field is created around it as shown below in Figure Q2a You

Question

A long straight wire Wire 1 carries a current such that a magnetic field is created around it as shown below in Figure Q2a You may assume that its length continues indefinitely Magnetic Field Lines Figure Q2a Magnetic field lines around Wire 1 The magnetic field strength is 42 nT at a distance of 150 mm from the wire a i Calculate the magnitude of the current in the wire ii In which direction do the electrons flow in the wire upwards or downwards State the name of the rule you have used to determine this Another wire Wire 2 of length of 348 mm is positioned 150 mm from Wire 1 and oriented parallel to it as shown in Figure Q2b A current flows through Wire 2 and the two wires experience a repulsive magnetic force of magnitude 768 pN b Calculate the current in Wire 2 Wire 1 S Wire 2 Figure Q2b Wire 1 and Wire 2 3 2

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