Question

Figure shows the cress 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 $\frac { 3 R } { 2 }$from the axis of the cylinder will be

• A. Zero
• B.
• C.
• D.

Answer 1

Answer: (D)

Answer 2

By using $r = \frac { 3 R } { 2 }$

$a b = 2 R$ $B = \frac { \mu _ { 0 } i } { 2 \pi \left( \frac { 3 R } { 2 } \right) } \times \left\{ \frac { \left( \frac { 3 R } { 2 } \right) - R ^ { 2 } } { \left( R ^ { 2 } \right) - R ^ { 2 } } \right\}$.