Question

Two wires PQ and QR, carry equal currents I as shown in Fig. One end of both the wires extends to infinity. ŠPQR = q. The magnitude of the magnetic field at O on the bisector angle of these two wires at a distance r from point Q is–

• A. $\frac { \mu _ { 0 } } { 4 \pi }$
• B. $\frac { \mu _ { 0 } } { 4 \pi }$
• C. $\frac { \mu _ { 0 } } { 4 \pi }$
• D.

Answer 1

Answer: (D)

Answer 2

B_PQ = $\frac { \mu _ { 0 } \mathrm { I } } { 4 \pi ( \mathrm { s } \sin \theta / 2 ) }$ (cos0ŗ + cos q/2)$\overrightarrow { \mathrm { B } } _ { \mathrm { PQ } }$= $\frac { \mu _ { 0 } \mathrm { I } } { 4 \pi \mathrm { r } }$ .

$\frac { ( 1 + \cos \theta / 2 ) } { \sin \theta / 2 }$ $\odot$ =

\ B_net = $\odot$