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CUET

Q30. An electron enters a crossed electrical and magnetic field region with a speed of 100 m s-¹ along + x-axis and passes undeviated. The strength of magnetic field is 5.0 T and it acts along + z-axis. Give the electrical field in vector notations indicating its magnitude as well as direction: (a) (500 V m⁻¹) (b) -(500 V m⁻¹)k (c) (100 V m⁻¹) (d) -(100 V m⁻¹)k