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The magnetic field at a point inside a ...

The magnetic field at a point inside a 2.0 mH inductor coil becomes 0.80 of its maximum value in `20 mu s ` when the inducto is joined to a battery. Find the resistance of the circuit.

A

`80 Omega`

B

`320 Omega`

C

`160 Omega`

D

`40 Omega`

Text Solution

Verified by Experts

The correct Answer is:
C
`Cr_(2)O_(3)(s)+Na_(2)CO_(3)(s)underset("state in absence of air")overset("Heated to molten")(rarr) underset(("x")) (NaCrO_(2))+CO_(2)(g)`
`NaCrO_(2)+underset(("excess"))(H_(2)O)rarrNa[Cr(OH)_(4)]overset(CO_(2)(g))(rarr) Cr(OH)_(3)darr`
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