Question Text
Question 4 :
Assertion(A): An inductor in a D.C. circuit opposes both a steady current and a changing current.Reason(R): Induced emf is generated only when the flux linked with the inductor remains unchanged.<br/>
Question 5 :
If $0.1J$ of energy is stored for the flow of current of $0.2A$ in an inductor, then its inductance value is:
Question 7 :
A<i></i>conductor is moving with the velocity vin the magnetic field and induced current is I. If the velocity of conductor becomes double, the induced currentwill be
Question 8 :
A source of 220 V is applied in an A C circuit . The value of resistance is 220 $\Omega$. Frequency & inductance are 50Hz & 0.7 H then wattless current is
Question 9 :
This $Sl$ unit of inductance, the henry can be written as:
Question 10 :
The direction of induced current in a coil or circuit is such that it opposes the very cause of its production. This law is given by
Question 11 :
The magnetic flux through a circuit of resistance R changes by an amount $\Delta\phi$ in a time $\Delta t$. Then the total quantity of electric charge Q that passes any point in the circuit during the time $\Delta t$ is represented by :
Question 12 :
If emf induced in a coil is $2V$ by changing the current in it from $8\ A$ to $6\ A$ in $2\times 10^{-3}s$, then the coefficient of self induction is