JEE Advanced 2020 Full Test 4 Paper 2

A uniform electric field E is present horizontally along the paper throughout region but uniform magnetic field B0 is present horizontally (perpendicular to plane of paper in inward direction) right to the line AB as shown. A charge particle having charge q and mass m is projected vertically upward and crosses the line AB after time t0. The speed of projection if particle moves after t0 with constant velocity. (given qE=mg) is nt0. Find the value of 'n'. (g=9.8m∕s2)