Question

PLEASE HELP ME AND SHOW STEPS. THANK YOU

1) It is desined to step up a vollage of 120 V to 96,000 v. The turns ratio N/N, of the transformer a) I/28 b) (64 x 10y )28 d) 8001 if the voltage is stepped that power is not lost in an ideal transformer, consider the situation in the above question. 2) Starting from the idea t up 800 times, the current is a) the same, since power is the same on both sides. c) the current is 800° greater in the secondary e) the current is stepped down by 800 times in the primary and secondary to conserve energy current is 800 times stepped up also. 3) A wire 30 cm long with an east-west orientation carries a current of 3.0 A towards the West. There is a uniform magnetic field cular to this wire. If the force on the wire is 0.18 N downwards, what is the direction and magnitude of the magnetic TLE ?) 2.0 x lo-Tup b) 020 T upe) 0.20 T north d) 0.20 T south e) 2.0x 103 T north 4) The plane of a circular, 200-tum col of radius 5.25 em is perpendicular to a uniform magnetic field produced by a large electromagnet This field is changed from 0.650 T to 0.150 T in 0.0200 s. What is the magnitude of the emf induced in the coil? a) 0435 V b) 1.7 V c) 0.2175 v d) 87V )43.3V 5) A 25-cm long conducting rod moves at a speed of 25 m's in a plane perpendicular to a uniform magnctic field of magnitude 0 80 T. What is the induced potential difference between the ends of the rod? a) 24 V b) 2.4V c) 0.24 V d)500v 650 v 6) The proton shot into a magnetic field at right angles will travel in a circle, of course. If the same conditions as above prevail and the another proton is shot into the field at 3x the speed, its period will be a) smaller by 3 timesb) greater by 9 times c) greater by 3 timesd) smaller by 9 times e) the same 7) A proton is accelerated from rest through a potential difference of 600 V. It then enters a region of uniform magnetic field and moves in a circular path (radius 12 cm). What is the magnitude of the magnetic field in this region? a) 7.35 mT 5.3 mT c)4.9 mT d) 294mT e14.7 mT 8) An alpha-particle and a deuterium nucleus (consisting of a proton boundo heuron) are both shot into a magnetic field: the period of orbit of the proton compared to that of the deuterium nucleus is a) the same b) about twice c) about half d) four times e) one fourth 9) A wire carries an electrical current straight down. What is the direction of the magnetic field due at a point to the West of the wire? a) East b)west c) South d) Upward e) North 10) The magnetic field of the Earth points from South to North. A cosmic ray negative muon (") (which is a 'heavy' electron) moves directly towards the West. It will be deflected a) North b) East c) Downward d) South e) Upward ? ) An electron passes through a region where there is an electric field E: 63 x 10 Vin and a magnetic field B-000 T. The directions of the electric field, the magnetic field, and the electron velocity are mutually perpendicular. If the electron is NOT deflected from its straight line path through these fields, its velocity must be a) 3.6 x 104 m/s b) 7.0 x 107 m/s c) 143 x 10"m/s d)12x 104 mis e)44 x 10 m/s 12) An electric heater draws an average power of 1 100 Watts when plugged into a 110 V-rms outlet. Calculate the resistance of the heater and the rms current. (Treat rms values as DC.) b) 0 09?·11 A (rms) e) 10?. 1 A (rms) c) 112, 10 A (rms) a) 10?. 110A (rms) d) 1102, 10 A (rms) 13) A helium-neon laser ( line spacing, d? 632.8 nm) is used to calibrate a diffraction grating. If the first-order (n 1) maximum occurs at 20.5°, what is the a) 676 nmm b) 1810 nm c)10 000 nm d)100 000 nm e) 1310 m

Answer 1

12 o V Ns N 960o o Boo ②-the cumi ont is stepped duon bd 800 hinnas