The coil had 100 turns- The radius of each turn is 20 cm-An iron rod - r -35 is introduced inside it- Find the magnetic field at the centre when current in coil is 2 A-

The correct option is D 0.022 T n= 100 , r = 20 cm = 0.2 m, μ r=μμ _0= 35 i= 2A ⇒μ = 35 μ _0 μ = 35× 4π× 10^ 7 m k.s unitField at ...

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Standard XII

Physics

Magnetic Field

The coil had ...

Question

The coil had 100 turns. The radius of each turn is $20 c m$ .An iron rod $(μ_{r} = 35)$ is introduced inside it. Find the magnetic field at the centre when current in coil is $2 A$ .

0.022 T

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0.22 T

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0.33 T

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0.033 T

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Solution

The correct option is D $0.022 T$
$n = 100$ , r = 20 cm = 0.2 m, $μ r = \frac{μ}{μ_{0}} = 35$
$i = 2 A$
$\Rightarrow μ = 35 μ_{0}$
$μ = 35 \times 4 π \times 10^{- 7}$
m k.s unit
Field at certen will
be $B = \frac{μ i}{2 r} \times m$
$B = \frac{35 \times 4 π \times 10^{- 7} \times 2 \times 100}{2 \times 0.2}$
$\Rightarrow B = .0219 \approx .022$ Tesla
m.k.s unit.

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The coil had 100 turns. The radius of each turn is 20cm.An iron rod (μr=35) is introduced inside it. Find the magnetic field at the centre when current in coil is 2 A.

The correct option is D 0.022 Tn=100, r = 20 cm = 0.2 m, μr=μμ0=35i=2A⇒μ=35μ0μ=35×4π×10−7m k.s unitField at certen willbe B=μi2r×mB=35×4π×10−7×2×1002×0.2⇒B=.0219≈.022 Teslam.k.s unit.

The coil had 100 turns. The radius of each turn is $20 c m$ .An iron rod $(μ_{r} = 35)$ is introduced inside it. Find the magnetic field at the centre when current in coil is $2 A$ .