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?

Q: 15. How much work is done by a magnetic field as a charged particle circulates through it? A. It…

A: Let the charge = q Let the speed of the charged particle = v Let the magnetic field = B

Q: 1. An electron experiences a magnetic force of 8.32×10-17 N when traveling at 19.5° with respect to…

A:

Q: Question 18 James makes two electromagnets, as shown in the figure below:

A: Since the magnetic field depend upon the current and the current is  Proportional to voltage so…

Q: nature. d. Gradually changing climate patterns in nature e. Ionization in the atmosphere that is…

A: The Earth's core's magnetism is caused by the electrical conductivity of the liquid metal it…

Q: A beam of electrons moves in the direction indicated by the blue arrow.  In what direction would the…

A: Right-hand thumb rule: Thumb rules state that if the thumb of the right-hand points in the direction…

Q: #5. What is the direction of a magnetic field if a proton is moving in a circular clockwise…

A: We know that the magnetic force is given by

Q: Two current-carrying wires are arranged such that the net force between the two wires is attractive.…

A: Ques: Two current-carrying wires are arranged such that the net force between the two wires is…

Q: 1. An electron is moving near a long, current carrying wire with a speed of v = 1100 m/s. When the…

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Q: Match the given description to the correct classification of magnetic materials. Materials that do…

A: Three types of magnetic materials are Ferromagnetic materials Paramagnetic materials Diamagnetic…

Q: 4. Two 4.0 m-long parallel wires are separated by 1 cm. The upper wire carries a current of 4 A…

A:

Q: Parallel Wires: Two long, parallel wires carry currents of different magnitudes. If the current in…

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Q: 7. A current (I) flows from left (L) to right (R) in a long, straight conductor as shown in the…

A: Direction of current = left to right Direction of velocity of electron  = left

Q: 5. You hook up a slinky to some batteries and run current through it. You use a Hall probe to…

A: The problem is asking for the number of turns in the slinky. The magnetic field inside a solenoid…

Q: match what happens when a ferromagnetic material is placed in an external magnetic field. a. The…

A: Given : When a ferromagnetic material is placed in an external Magnetic field:   To Determine:…

Q: 7. A proton is moving through a magnetic field in a direction perpendicular to the field as shown…

A: Given: The strength of the magnetic field is 0.13 T. The magnitude of the magnetic force on the…

Q: What is the magnitude of the force acting between a 20-cm length of the two current-carrying,…

A:

Q: 14. Two current carrying wires are placed geometrically parallel on a table. Both carry identical…

A: Given: Currents I1 and I2 = 10A each Force =F

Q: 4. Two parallel wires carry the same current and are at a distance r from each other. a. They repel…

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Q: Two long parallel wires carry currents in the same direction. What happens to the magnitude of the…

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Q: A charge of -8.41 µC is traveling at a speed of 8.16 x 10° m/s in a region of space where there is a…

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Q: 4. Draw B field lines for the magnetic field produced by the objects shown in Figure P20.40.

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Q: A loop of electric current will create A. a long, straight B field B. a magnetic dipole B field C. a…

A: option B is correct as explained in the image attatched.

Q: A very long, straight wire carries a current of 38 A in the +k direction. An electron 2.4 cm from…

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Q: he bar magnet is flipped over and the south pole is

A: 1. When the south pole brought near the steel ball , the ball is still attracted towards the magenet…

Q: Two identical coils of wire are connected to different power supplies. The current in coil A is 0.50…

A: At the same distances, the magnetic fields due to their current-carrying coils are calculated. Write…

Q: A moving, positively charge particle enters a region that contains a uniform magnetic field as shown…

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Q: What is the magnitude of the force acting between a 20-cm length of the two current-carrying,…

A: The force between two current carrying parallel wires is given as F=μoIiI22πrLI1 and I2 are the…

Q: A proton moving in the direction of the +x-axis enters a magnetic field. If the electron experiences…

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Bar Magnet

In physics, magnetism is a phenomenon exhibited by a magnetic substance that exerts either attractive or repulsive force. A bar magnet is either a rectangular or round and hollow fit comprised of ferromagnetic materials and has a fanciful attractive field surrounded by it.