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Physics - Magnetism Question with Solution | TestHub

PhysicsMagnetismMagnetic torque & energyEasy2 minPYQ_2014

PhysicsEasysingle choice

Two parallel long wires $A$ and $B$ carry currents $i_{1}$ and $i_{2} (< i_{1})$ . When $i_{1}$ and $i_{2}$ are in the same direction, the magnetic field at a point mid way between the wires is $10 μ T$ . If $i_{2}$ is reverse the field becomes $30 μ T$ . The ratio $i_{1} / i_{2}$ is

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Answer:

Solution:

$\frac{μ _{0}}{4 π} \frac{2 i _{1}}{r} - \frac{μ _{0}}{4 π} \frac{2 i _{2}}{r} = 10 μ T$ $\frac{μ _{0}}{4 π} \frac{2 i _{1}}{r} + \frac{μ _{0}}{4 π} \frac{2 i _{2}}{r} = 30 μ T$ On solving $i_{1} = 20 A$ and $i_{2} = 10 A . ∴ i_{1} / i_{2} = 2$

Stream:AIIMSSubject:PhysicsTopic:MagnetismSubtopic:Magnetic torque & energy

⏱ 2mℹ️ Source: PYQ_2014

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