Q. The variation between $V - i$ has been shown by $V - i$ graph for heater filament.
A) [image:3_image74.emf]
B) [image:3_image75.emf]
C) [image:3_image76.emf]
D) [image:3_image77.emf]
Explanation
(a) As the current in heater filament increases, it gets more heated, hence its temperature increases and thereby its resistance increases. Due to which the current will decrease. Hence the variation of $V$ and $i$ for heater filament will as shown in Fig.(a)
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.