In an inertial reference frame K there is only a uniform electric field E = 8 kV/m in strength. Find the modulus and direction
(a) Of the vector E',
(b) Of the vector B' in the inertial reference frame K' moving with a constant velocity v relative to the frame K at an angle a = 45 ° to the vector E. The velocity of the frame K' is equal to a = 0.60 fraction of the velocity of light.