Alternating Current Applied to an Inductor

Q. A choke coil has

1. High inductance and low resistance
2. Low inductance and high resistance
3. High inductance and high resistance
4. Low inductance and low resistance

Q. 17. A-The quantity L/R possesses dimension of time R-to reduce the rate of increase of current through a solenoid we should increase the time constant

Q. An inductance $L$ and a resistance $R$ are first connected to a battery. After attaining steady state, the battery is disconnected but $L$ and $R$ remain connected in a closed circuit. Then, the current reduces to $37\%$ of its initial value in time -

Q. An emf of 15v is applied in a circuit containing 5H inductor and 10 ohm resistance. The ratio of currents at t=infinity to t= 1sec is

Q. current I through an inductor is increasing according to I=2t. Variation of rate of increment of its energy dU/dt with time t is correctly shown in the graph

Q. A circular copper disc, of radius $5\text{cm}$, rotates with $10\text{rad/s}$ about an axis through its center and perpendicular to the disc. A uniform magnetic field of $2\text{T}$ acts perpendicular to the plane of the disc. What is the induced current in the disc if a resistor of resistance $1\Omega$ is connected between the midpoint of a radius and the center of the disc?

Q. An inductive circuit contains a resistance of 10 ohm and an inductance of 2.0 henry. If an ac voltage of 120 volt and frequency of 60 Hz is applied to this circuit, the current in the circuit would be nearly

1. 0.32 amp
2. 0.16 amp
3. 0.48 amp
4. 0.80 amp

Q. An alternating e.m.f. of angular frequency is applied across an inductance. The instantaneous power developed in the circuit has an angular frequency

1. $\frac{\omega }{4}$
2. $\frac{\omega }{2}$
3. $\omega$
4. 2$\omega$

Q. An inductive circuit contains a resistance of 10 ohm and an inductance of 2.0 henry. If an ac voltage of 120 volt and frequency of 60 Hz is applied to this circuit, the current in the circuit would be nearly

1. 0.32 amp
2. 0.16 amp
3. 0.48 amp
4. 0.80 amp

Q.

In pure inductive circuit, the curves between frequency f and reciprocal of inductive reactance 1/X_L is

1. 
   

2. 
   

3. 
   

4. 
   

Q. A $200\Omega$ resistor has a certain colour code. If one replaces the red colour by green in the code, the new resistance will be

1. $500\Omega$
2. $400\Omega$
3. $300\Omega$
4. $100\Omega$

Q. if the rate of current of 2 A/s induces an emf of 10mV in a solenoid what is the self inductance of the solenoid?