A potential difference is applied across a copper wire of radius 0.5 mm. It results in a…
Physics · JEE Advanced · NTA Exams — Current Electricity
A potential difference is applied across a copper wire of radius 0.5 mm. It results in a uniform electric field of 1.5 V/m along the length of the wire. Consequently there is a current in the wire. Temperature of the wire is 60oC.Assuming each copper atom contributes one free electron .Given that density of copper is 8.9 gm/cm3 and resistivity of copper at 20oC is 1.7×10–8 ohm.m and its temperature coefficient of resistivity at 20oC is 3.9×10–3/OC . Atomic mass of copper is 63.5 . Answer the following questions.
Current density in the wire is
- 11.24 × 106 A/m2
- 5.4 × 107 A/m2
- 7.65 × 107 A/m2
- 52.5 × 106 A/m2
Answer
(C) 7.65 × 10 7 A/m 2
Sign up free on Edukali to view the step-by-step worked solution and practice thousands of similar questions.
Related practice questions
- Statement-1 : In a Meter Bridge experiment, null point for an unknown resistance is measured. Now the unknown…
- Statement–1 : Two unequal resistors are connected in series across a cell. Then the potential drop across the…
- The potentiometer basically consists of a uniform wire of resistance R through which a steady current flows…
- Statement– 1 : In the circuit shown assume both cell are ideal and of fixed e.m.f., the resistor R 1 is…
- Four Bulbs B 1 , B 2 , B 3 and B 4 of 100 W each are connected to 220 V main as shown in the figure. The…
- A piece of copper and another of germanium are cooled from room temperature to 80 K. The resistance of
- An incandescent bulb has a thin filament of tungsten that is heated to high temperature by passing an…
- In the circuit, the galvanometer G shows zero deflection. If the batteries A and B have negligible internal…
More Current Electricity questions · Browse all practice questions