7) You need to swipe your credit card, and not just dawdle along, to a. keep the

Question

7) You need to swipe your credit card, and not just dawdle along, to a. keep the line moving and speed up the process. b. generate more flux to read the card properly. c. change the flux more rapidly to read the card d. charge the card-literally- by friction 18) The Samsung Galaxy S7, and some other smartphones, can be charged wirelessly by laying them on a special charger, as shown, which uses magnetic fields to recharge the phone battery. Cool! The current in the transmitter coil in the charger must be a. either AC or DC; either one PRON would work b. alternating current or AC. c.direct current or DC 19) Since the field in the transmitter coil points straight up coil must by moving the page, as shown, the current in the a. clockwise. b. counterclockwise. c. - we don't have enough information to tell. 20) This phone charging system is a direct application of Law. a. Amperes b. Coulomb's c. Faradays d. Ohm's 21) Mark the letter B for item 21 on the answer sheet so I know which version of the test you took. Put your test in the crate on the side table, and put your answer sheet in the shallow tray marked B to the right of the crate. Please exit by the door at the right front of the classroom so as to minimize disruption to other students. Be certain that you have filled in the bubble for answer B for item number a.

Explanation / Answer

17) we need to swipe out card to change the flux because if there is relative motion between current carrying coil and source of magnetic field originator then there will be change in flux and change in flux results in induced emf and so induced current.

so option b is correct.

18) alternating current or AC because whenever there is change in flux, emf will be induced and so if DC will be there then change in flux will take place only in the starting when current starts flowing after that no induced EMF will be there.

so option b is correct.

19)

magnetic field is pointing straight up the pade so current in coil must be counter clockwise (by right hand thumb rule we can determine)

so option b is correct.

20) phone charging system is direct application of Faraday's Law.

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