Can someone solve these problems Thank You so Much!

An electron is accelerated from rest through potential difference V and then enters a region of uniform magnetic field, where it undergoes uniform circular motion. The figure gives the radius r of that motion versus V1/2. The vertical axis scale is set by Is= 2.23 mm, and the horizontal axis scale is set by V,1/2= 19.7 V1/2. What is the magnitude of the magnetic field? r (mm) 0 VI/2 Vi/2 (V1/2) Number i Units V e Textbook and Media Save for Later Attempts: 0 of 3 used Submit AnswerCurrent Attempt in Progress In the figure, an electron with an initial kinetic energy of 4.00 keV enters region 1 at time t = 0. That region contains a uniform magnetic field directed into the page, with magnitude 0.0140 T. The electron goes through a half-circle and then exits region 1, headed toward region 2 across a gap of 28.0 cm. There is an electric potential difference AV = 2000 V across the gap, with a polarity such that the electron's speed increases uniformly as it traverses the gap. Region 2 contains a uniform magnetic field directed out of the page, with magnitude 0.0186 T. The electron goes through a half-circle and then leaves region 2. At what time t does it leave? Region 1 Region 2 Number UnitsView Policies Current Attempt in Progress In a certain cyclotron a proton moves in a circle of radius 0.550 m. The magnitude of the magnetic field is 1.80 T. (a) What is the oscillator frequency? (b) What is the kinetic energy of the proton? (a) Number i Units (b) Number i Units e Textbook and Media Save for Later Attempts: 0 of 3 used Submit