Lightning occurred in a forest and a tree standing vertically in the forest provided a path along which the lightning passed. (i) Sketch a diagram showing the electric field and equipotentials at the point on the ground where the tree is located. Suppose 600×10−3 C of charge is conducted through the tree in 1.0 µs (ii) Calculate the average current. (iii) Sketch the temporary magnetic field created by this current. (iv) What will the magnetic field strength be 10 cm from the tree?

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