AP EAMCET2001PhysicsCurrent Electricity
A nichrome wire 50 ~cm long and 1 ~mm ^2 cross-section carries a current of 4 ~A . When connected to 2 volt battery. The resistivity of nichrome wire in - m is
Options
- A1 10⁻⁶
- B4 10⁻⁷
- C3 10⁻⁷
- D2 10⁻⁷
Correct answer
A. 1 10⁻⁶
Step-by-step solution
aligned l=50 ~cm & =50 10⁻² ~m A & =1 ~mm ^2=1 10⁻⁴ ~m ^2 i & =4 ~A , V=2 volt aligned Resistance of wire, R= V i = 2 4 =0.5 aligned Resistiviry, & =R A l =0.5 1 10⁻⁶ 50 10⁻² & = 0.5 1 10⁻⁴ 50 & =1 10⁻⁴ - fm aligned