Assertion : An electric bulb becomes dim, when the electric heater in parallel circuit is switched on.
Reason : Dimness decreases after sometime.
A
If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
B
If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
C
If the Assertion is correct but Reason is incorrect.
D
If both the Assertion and Reason are incorrect.
AIIMS 2008, Easy
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B
If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
b The electric power of a heater is more than that of a bulb. As $P\, \propto \,\frac{1}{R}$, the resistance of heater is less than that of the electric bulb. When a heater connected in parallel to the bulb is switched on, it draws more current due to its lesser resistance, consequently, the current through the bulb decreases and so it becomes dim. When the heater coil becomes sufficient hot, its resistance becomes more and hence it draws a little lesser current. Consequently, the current through the electric bulb recovers.
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