Select the correct answer.
What happens when a rubber balloon is rubbed against wool and gains electrons?
OA.
A positive charged is induced on the balloon and the wool acquires a negative charge.
B.
A negative charged is induced on the balloon and the wool acquires a positive charge.
C.
The balloon and the wool both become positively charged.
D.
The balloon and the wool both become negatively charged.
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The heater element of a 120 v toaster is a 5.4 m length of nichrome wire, whose diameter is 0.48 mm. the resistivity of nichrome at the operating temperature of the toaster is 1.3 × 10-6 ω·m. the toaster is operated at a voltage of 120 v. (a) what is the power drawn by the toaster? (b) if the cost of electricity is 12 ¢ per kilowatt-hour, and it takes 2 minutes to toast bread, how much does it cost for toasted bread? (c) when the heater element is at room temperature, is the resistivity in the nichrome wire greater than, less than, or equal to it’s resistivity when at operating temperature? explain.