please solve all 3 problems

There is a rectangle of length 5.20 em and width 5.70 cm in the xyplane. If the electric field can be expressed by (100.# +186 k) N/C, what is the flux through the rectangle? O 0.551 N m/C O 0.620 N m/C OON m/C O 0.296 N m'/C Question 2 In the figure above, the negative charge has a magnitude of 28.0 nC (and lies inside the doughnut shape) and the positive charge has a magnitude of 73.0 nC. What is the flux through the doughnut surface? O -3.16x103 Nm3/C Q 3. 16:103 Nim3/C O 8.25x10' Nm/C O -6.25x103 Nm3/C Question 3 The figure shows a conductor with a hollow cavily inside. If the cavity contains a positive charge of Q- 5.30 ng, what is the electric flux through the closed surface indicated in the figure? 4,09x1020 Nm3/C O 503 NT2/C O 1.67x103 NTC O D NT/C