Why do you need to swipe your credit card in the credit card reader for it to accept your charge? A. The current in the reader flows when the credit card strip is stationary. B.The magnetic field in the credit card strip only exists when it is moving. C. The magnetic field in the reader only works when the credit card is moving. D. The magnetic field in the credit card strip needs to move to induce a current in the reader. ____8. Which of the following laws is used to find the direction of the induced current in a loop of wire placed in a changing magnetic field? Lenz’s Law C. Faraday’s Law Ampere's Law D. Biot-Savart’s Law ____9. Lenz’s law concerning the direction of an induced current in a conductor by a magnetic field could be a restatement of?
Why do you need to swipe your credit card in the credit card reader for it to accept your charge?
A. The current in the reader flows when the credit card strip is stationary.
B.The magnetic field in the credit card strip only exists when it is moving.
C. The magnetic field in the reader only works when the credit card is moving.
D. The magnetic field in the credit card strip needs to move to induce a current in the reader.
____8. Which of the following laws is used to find the direction of the induced current in a loop of wire placed in a changing magnetic field?
- Lenz’s Law C. Faraday’s Law
- Ampere's Law D. Biot-Savart’s Law
____9. Lenz’s law concerning the direction of an induced current in a conductor by a magnetic field could be a restatement of?
- Ohm’s Law 3. Universal Law of Gravitation
- Ampere’s Law 4. The Law of Conservation of Energy
Faraday’s laws are result of the conservation of which quantity?
- Ohm’s Law
- Ampere’s Law
- Universal Law of Gravitation
- The Law of Conservation of Energy
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