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Test your physics knowledge with a real daily question. Pick your level and give it a go!
In a lab, a 9.0 V DC bench supply is connected to a single 18 Ω resistor R1; an ammeter in series with R1 reads the current in R1. Without changing the supply, a second identical 18 Ω resistor R2 is connected in parallel across the same supply, while the ammeter remains measuring only the current through R1. Leads and internal resistance are negligible. Which statement must be true for the current in R1 after R2 is added?
In a lab, a conducting aluminium ring is dropped coaxially toward the open end of a vertical solenoid that carries a steady DC current. Air resistance is negligible. Compared with an identical drop when the solenoid current is switched off, which statement must be true about the ring’s speed as it reaches the solenoid’s mouth? (Focus on field and energy reasoning.)
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