Please solve this ez multiple choice Fully and fast! Thanks hero!!

Question 17. The magnetic field 0.30 m from a long straight conductor is 4.2 X 10'4 T (A) J conductor 3/ ii: 4.2 x 104 T *5 .' Find the magnitude and direction of the current in the conductor. A. 100 A up the page C. 630 A up the page B. 100 A down the page D. 630 A down the page Question 18. As switch S is closed, in what direction does the compass needle point and what is the direction of the current through resistor R? (C) GEES??? COMPASS NEEDLE DIRECTION CURRENT DIRECTION THROUGH R A. west From 1 to 2 B. west I From 2 to l I C. east I From l to 2 I D. east I From 2 to l I Question 19. A thin layer of oil oating on water produces the spectral colours in much the same way that (K) A. a soap bubble reects the spectral C. a triangular prism cause refraction colours and disperses the colours B. a diffraction grating causes an D. a light that goes through a glass interference pattern Question 20. You observe the wave pattern in the gure as you investigate periodic waves in a ripple tank. You draw the straight lines shown superimposed on the gure. (I) The wavelength is A. i C E L L B. E D. 2i 21. 3L Question 21. When a light enters from a medium with index of refraction of 1.45 into a medium with index of refraction of 1.33. Determine the critical angle that will result in a total internal reflection. (I) A. 43.60 C. 48.80 B. 66.50 D. Unable to determine. Question 22. Which of the following is NOT a relativistic effect when an object is travelling approach the speed of light? (K) A. Mass increases C. Energy decreases B. Length contracts D. Time dilates Question 23. A photon has energy of 2.85 eV, what would be the wavelength of this photon? h = 4.14X10_159V-S (A) A. 215 nm C. 52.1 nm B. 436 nm D. 358 nm Question 24. In photoelectric effect, the stopping potential of the ejected electron is plotted against the frequency as shown: (K) 3.0- Stopping Potential (V) 1.0- 0.5 0 1 2 3 4 5 6 7 8 9 10 11 12 13 Frequency (x 1014 Hz) What is the slope of this graph? A. The mass of the electron C. The universal gravitation constant B. The Planck's constant D. The Coulomb constant Question 25. During the Michaelson-Morley experiment, which of the following was proven? (K) I. light travels as both particle and wave II. there is no ether III. speed of light is the same in all direction A. I, II C. I, III B. II, III D. All of the above