19. An electrically charged balloon is placed next to a strong bar magnet. What

Question

19. An electrically charged balloon is placed next to a strong bar magnet. What ha is placed at appens? Nothing. b. The balloon wilf move towards the north pole of magnet. "C The balloon wi move towards the south pole of magnet. d. The balloon will float above the magnet. e. The balloon will circle the magnet. a. olog 20. Neon signs require about 12,000 volts to o the circuit uses a 120-volt power source, the ratio of primary to secondary turns on the transformer should be a. 1:100 b. 100:1 c 1:1 d. -10:1 e:10 gnivom jon A bar magnet is held close to a loop of wire. All of the following except for one will change the magnetic flux through the loop. Which one? a. Moving the bar magnet closer to the loop. b. Increasing the strength of the magnet c. Moving the loop towards the bar magnet d. Increasing the number of loops in the wire. 21. og 22. The role of a commutator in a DC motor is to a. keep the current in the coil of wire flowing the same direction. b. reverse magnetic forces on the wire coil every half rot c. reverse the flow current the direction of the ation. every hal rotatiow of current through the wire coil rotation. d. induce a m ion. d. induce a magnetic field. 23,

Explanation / Answer

20) turn ratio = V1/V2

N1/N2 = 12000/120

= 100/1

so the ratio of primary to the secondary turns = 100:1

so option B) 100:1 is the correct answer

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