(B) For $D.C.$ supply,the coil acts as a pure resistor because the frequency is $0$. $R = \frac{V}{I_{DC}} = \frac{100}{25} = 4\, \Omega$. For $A.C.$

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(B) For $D.C.$ supply,the coil acts as a pure resistor because the frequency is $0$. $R = \frac{V}{I_{DC}} = \frac{100}{25} = 4\, \Omega$. For $A.C.$ supply,the coil has both resistance $R$ and inductive reactance $X_L$. The impedance $Z$ is given by $Z = \frac{V}{I_{AC}} = \frac{100}{20} = 5\, \Omega$. Since $Z^2 = R^2 + X_L^2$,we have $X_L = \sqrt{Z^2 - R^2}$. $X_L = \sqrt{5^2 - 4^2} = \sqrt{25 - 16} = \sqrt{9} = 3\, \Omega$.

Class 11 Chemistry Data Entry - Chemistry Level 0 of all question bank

$A$ student connects a long air-cored coil of manganin wire to a $100\, V$ $D.C.$ supply and records a current of $25\, A$. When the same coil is connected across a $100\, V$,$50\, Hz$ $A.C.$ supply,the current reduces to $20\, A$. The reactance of the coil is ...... $\Omega$.

A
$4$
B
$3$
C
$5$
D
None

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$A$ student connects a long air-cored coil of manganin wire to a $100\, V$ $D.C.$ supply and records a current of $25\, A$. When the same coil is connected across a $100\, V$,$50\, Hz$ $A.C.$ supply,the current reduces to $20\, A$. The reactance of the coil is ...... $\Omega$.

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Water in a river $20 \ m$ deep is flowing at a speed of $10 \ ms^{-1}$. The shearing stress between the horizontal layers of water in the river in $Nm^{-2}$ is (Coefficient of viscosity of water $= 10^{-3} \ SI$ units).

Which of the following is not a colligative property?

How many $H$ atoms are present in $0.046 \, g$ of ethanol $(C_2H_5OH)$?

There are two wires of the same material and same length. If the diameter of the second wire is $2$ times the diameter of the first wire,then the ratio of the extension produced in the wires by applying the same load will be:

If the difference between the roots of $x^2+ax+b=0$ and $x^2+bx+a=0$ is the same,and $a \neq b$,then:

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