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Current Electricity question

2010 · Shift 1 · Q67

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PYQ Library
JEE Advanced
Physics
Current Electricity
2010 · Shift 1 · Q67

Current Electricity question

2010 · Shift 1 · Q67

JEE AdvancedPhysicsCurrent ElectricityMCQ+3 / −1

Incandescent bulbs are designed by keeping in mind that the resistance of their filament increases with the increase in temperature. If at room temperature, 100, 60 and 40 W bulbs have filament resistances R100, R60 and R40 respectively, the relation between these resistances is

A
${1 \over {{R_{100}}}} = {1 \over {{R_{40}}}} + {1 \over {{R_{60}}}}$
B
${R_{100}} = {R_{40}} + {R_{60}}$
C
${R_{100}} \gt {R_{60}} \gt {R_{40}}$
D
${1 \over {{R_{100}}}} \gt {1 \over {{R_{60}}}} \gt {1 \over {{R_{40}}}}$

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