NEET Questions

In an $LR$-circuit time constant is that time in which current grows from zero to the value (where ${I_0}$ is the steady state current)

A coil of inductance $300\,\,mH$ and resistance $2\,\,{\rm{\Omega }}$ is connected to a source of voltage $2\,\,V$. The current reaches half of its steady state value in

A coil of inductance $300\,\,mH$ and resistance $2\,\,{\rm{\Omega }}$ is connected to a source of voltage $2\,\,V$. The current reaches half of its steady state value in

The current in a $LR$ circuit builds up to $3/{4^{th}}$ of its steady state value in $4\,s$. The time constant of this circuit is

The current in a $LR$ circuit builds up to $3/{4^{th}}$ of its steady state value in $4\,s$. The time constant of this circuit is

A uniformly wound solenoid coil of self-inductance $1.8 imes \,\,{10^{ - 4}}\,{\rm{H}}$ and resistance ${\rm{6}}\,\,{\rm{\Omega }}$ is broken up into two identical coils. These identical coils are then connected in parallel across a ${\rm{12}}\,\,{\rm{V}}$ battery of negligible resistance. The time constant for the current in the circuit is

An inductance $L$ and a resistance $R$ are first connected to a battery. After some time the battery is disconnected but $L$ and $R$ remain connected in a closed circuit. Then the current reduces to ${\rm{37}}\,\,{\rm{\% }}$ of its initial value in

An inductance $L$ and a resistance $R$ are first connected to a battery. After some time the battery is disconnected but $L$ and $R$ remain connected in a closed circuit. Then the current reduces to ${\rm{37}}\,\,{\rm{\% }}$ of its initial value in

An ideal coil of $10\,\,henry$ is joined in series with a resistance of $5\,\,ohm$ and a battery of $5\,\,volt$. 2 seconds after joining, the current flowing in $ampere$ in the circuit will be

An ideal coil of $10\,\,henry$ is joined in series with a resistance of $5\,\,ohm$ and a battery of $5\,\,volt$. 2 seconds after joining, the current flowing in $ampere$ in the circuit will be