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In an interial reference frame K there...

In an interial reference frame `K` there is only magnetic field with induction `B = b (yl -x)//(x^(2) + y^(2))`, where `b` is a constane, `i` and `j` are the unit vectors of the `x` and `y` axes. Find the elecric field strength `E'` in the frame `K'` moving relative to the frame `K` with a constatn non-relative velocity `v = vk, k` is the unit vector of the z-axis. The `z'` axis is assumed to coincule with the `z` axis. What is the shape of the field `E'` ?

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Unit of magnetic induction field B is

Unit of magnetic induction field B is