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Test your physics knowledge with a real daily question. Pick your level and give it a go!
A student powers one small torch bulb from a 6 V battery. They then add a second identical bulb in parallel with the first using short, negligible-resistance wires. Assume the bulbs behave like simple resistors over this range. Which statement must be true when the second bulb is connected?
A student tests a light sensor circuit powered by 5.0 V: a 10 kΩ fixed resistor is in series with an LDR to 0 V, and a voltmeter with 20 kΩ input resistance is connected across the LDR to read V_out at the junction. The LDR is 10 kΩ in the dark and 2.0 kΩ in bright light. Which statement must be true about the meter reading as the light increases? Estimate numerically.
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