Current Electricity, Charging & Discharging Of Capacitors / वर्तमान बिजली, चार्ज और कैपेसिटर का निर
JEE Main & Advanced
Physics
Current Electricity, Charging & Discharging Of Capacitors / वर्तमान बिजली, चार्ज और कैपेसिटर का निर
Question Bank
Electric Conduction Ohms and Resistance
question_answer
When a piece of aluminium wire of finite length is drawn through a series of dies to reduce its diameter to half its original value, its resistance will become [NCERT 1974; AIIMS 1997; MH CET 2000; UPSEAT 2001; CBSE PMT 2002]
A) Two times
B) Four times
C) Eight times
D) Sixteen times
Correct Answer:
D
Solution :
In stretching of wire \[R\propto \frac{1}{{{r}^{4}}}\]