Magnetic Fields & Devices Quiz

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Magnetic fields around wires and devices

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RIZQI - BEKASI

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Magnetic Fields & Devices Quiz


Froggy Jumps Magnetic Fields & Devices QuizVersión en línea Magnetic fields around wires and devices por RIZQI - BEKASI 1 Describe the pattern of the magnetic field around a straight current-carrying wire. a Radial lines from the wire b The magnetic field forms concentric circles around the wire. c A uniform field in all directions 2 Determine the direction of the magnetic field around a straight wire using the right-hand grip rule. a The field is radial outward from the wire b The field is tangential to circles around the wire; use right-hand grip rule to decide direction. c The field is perpendicular to the wire 3 Describe an experiment used to identify the magnetic field pattern around a straight wire. a Use a compass or iron filings around the wire to visualize the circular field lines. b Dip a compass in water near the wire c Stretch a magnet along the wire 4 State how the strength of the magnetic field changes with distance from the wire. a B ∝ 1/r, so it decreases with distance from the wire. b B ∝ r², it increases with distance c B ∝ r, it increases with distance 5 Describe the effect of increasing the current on the strength of the magnetic field. a Current has no effect on field strength b Increasing current weakens the field c Increasing current increases the magnetic field strength (B ∝ I). 6 Predict the effect of reversing the direction of the current on the direction of the magnetic field. a The field disappears b Reversing current reverses the magnetic field direction. c The field becomes radial 7 Describe the magnetic field pattern around a solenoid. a Inside: weak; Outside: strong b Field is only at the ends of the solenoid c Inside the solenoid, the field is strong and along the axis; outside, it is weak and circular. 8 Identify the north and south poles of an electromagnet. a North pole is where lines enter; South where they exit b The end where field lines exit is the North pole; the opposite end is South. c Poles depend on the material, not the field 9 Determine the direction of the magnetic field inside a solenoid. a The field is perpendicular to the axis b There is no field inside a solenoid c The field inside runs along the axis from South to North (direction depends on current). 10 Describe how increasing the current affects the strength of the magnetic field. a Increasing current strengthens the magnetic field (B ∝ I). b Current does not affect the field c Increasing current weakens the field 11 Predict how reversing the current affects the magnetic poles of the solenoid. a Pole strength increases but polarity stays b Pole positions stay the same with current reversal c Reversing current reverses the polarity: north and south swap. 12 Describe how the magnetic effect of a current is used in a relay. a An electromagnet pulls a switch to control another circuit. b Relays store magnetic energy for later use c Relays amplify electrical signals without magnets 13 Explain how a relay can be used to control another circuit. a Relays convert AC to DC b The electromagnet actuates a switch to control a separate circuit. c Relays heat the circuit to control it 14 Describe how the magnetic effect of a current is used in a loudspeaker. a DC current is used to vibrate the cone b Alternating current moves the coil, producing motion of the cone. c Relays drive the speaker directly with a magnet 15 Identify everyday applications of relays and loudspeakers. a Relays are used for data storage; loudspeakers for lighting b Relays and loudspeakers are only for labs c Relays in appliances/automotive systems; loudspeakers in radios, TVs, phones.

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Magnetic Fields & Devices Quiz

Froggy Jumps

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Creada por

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Magnetic Fields & Devices QuizVersión en línea

por RIZQI - BEKASI

Describe the pattern of the magnetic field around a straight current-carrying wire.

Determine the direction of the magnetic field around a straight wire using the right-hand grip rule.

Describe an experiment used to identify the magnetic field pattern around a straight wire.

State how the strength of the magnetic field changes with distance from the wire.

Describe the effect of increasing the current on the strength of the magnetic field.

Predict the effect of reversing the direction of the current on the direction of the magnetic field.

Describe the magnetic field pattern around a solenoid.

Identify the north and south poles of an electromagnet.

Determine the direction of the magnetic field inside a solenoid.

Describe how increasing the current affects the strength of the magnetic field.

Predict how reversing the current affects the magnetic poles of the solenoid.

Describe how the magnetic effect of a current is used in a relay.

Explain how a relay can be used to control another circuit.

Describe how the magnetic effect of a current is used in a loudspeaker.

Identify everyday applications of relays and loudspeakers.