I only need question 4 thank you !!!

A=29 B=39 C=139 D=12 r 1. There are an electron and a proton with distance r between each particle as shown. Take r = B cm. Take charge of electron and proton magnitude as 1.609 x 10 -19C and Coulomb P te constant as k= 8.99 x109 Nm /C2 a) Calculate net Electric field at point P, the middle between particles, what is the direction? (10 points) b) Calculate net Electric potential at P, does it have a direction? (10 points) 2. Consider the following circuits. a) Calculate equivalent capacitance between a-b terminal if C1=C2= B/2 UF, C3 = B UF (10 points) b) Calculate equivalent resistance between a-b terminal, If R=D(10Points) 3 R SR Write the Kirchhoff's potential difference rule for left and right loops by drawing your chosen current directions and loop directions. Use given symbols (10 points) RI R2 R3 3. a) There are two current wires. The left wire carries current outward and right wire carries the current inward directions. Calculate the magnetic field at P point if both wires are located at r = C cm or distance from the P and both carry the current I= 1.5 mA. What is the direction of magnetic field (use a word from up, down, left, right, in, out)? Permeability of air is Mo = 1.26 x 10-T/A (10 points) b) Three particles (proton, electron, and neutron) start to move right, as shown in the figure. Suddenly they encounter the same uniform magnetic field pointing out of the page and select three different paths. Which particles will choose a, b and c paths shown? (10 points) c) If the circular conductor in the figure undergoes thermal expansion while it is in a uniform magnetic field pointing out from the page. Which direction will be the current induced (CCW or CW)? Explain why. (10 points) 4 A beam of light hits the boundaries at a 30 angle from the normal as shown in each diagram. Assume that we are testing this new media in a vacuum chamber. Using your knowledge of the refractive index, rank the refractive index from least to greatest using 2.