23. The light bulbs in the circuit (shown on the right) are identical. Ignore the internal resistance of the batteries. When the switch is closed, (A) nothing changes (B) both go out (C) the intensity of light bulb A increases (D) the intensity of light bulb A decreases (E) the intensity of light bulb B increases

10. A copper telephone wire has essentially no sag between poles 35.0 m apart on a winter day when the temperature is -20.0°C. How much longer is the wire on a summer day when Tc = 35.0°C? Assume that the thermal coefficient of copper is constant throughout this range at its room temperature value. The average coefficient of linear expansion for copper is 17 × 10⁻⁶ (°C)⁻¹. (A) 3.27 cm (B) 4.12 cm (C) 1.00 cm (D) 12.04 cm (E) 8.40 cm

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