Physics-
General
Easy
Question
Figure shows the cross-sectional view of the hollow cylindrical conductor with inner radius 'R' and outer radius '2R', cylinder carrying uniformly distributed current along it's axis. The magnetic induction at point 'P' at a distance 
from the axis of the cylinder will be
The correct answer is:
According to question resistance of wire ADC is twice that of wire ABC. Hence current flows through ADC is half that of ABC i.e. 
. Also 
Þ 
and 
Magnetic field at centre O due to wire AB and BC (part 1 and (b) 
and magnetic field at centre O due to wires AD and DC (i.e. part 3 and (d) 
¤
Also i1 = 2i2. So (B1 = B(b) > (B3 = B(d)
Hence net magnetic field at centre O
.
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