An alternating e.m.f. is applied to purely capacitive circuit. Th… - Vidyadip

MCQ

An alternating e.m.f. is applied to purely capacitive circuit. The phase relation between e.m.f. and current flowing in the circuit is orIn a circuit containing capacitance only

A
e.m.f. is ahead of current by $\pi$ $ / 2 $
✓
Current is ahead of e.m.f. by $\pi$ $ / 2$
C
Current lags behind e.m.f. by $\pi$
D
Current is ahead of e.m.f. by $\pi$

✓

Answer

Correct option: B.

Current is ahead of e.m.f. by $\pi$ $ / 2$

b
(b) For purely capacitive circuit $e = {e_0}\sin \omega t$
$i = {i_o}\sin \left( {\omega t + \frac{\pi }{2}} \right)$ i.e. current is ahead of emf by $ \frac{\pi }{2} $

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

JEE STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

The angle between the vectors $(\hat i + \hat j)$ and $(\hat j + \hat k)$ is ....... $^o$

Block $B$ of mass $100 kg$ rests on a rough surface of friction coefficient $\mu = 1/3$. $A$ rope is tied to block $B$ as shown in figure. The maximum acceleration with which boy $A$ of $25 kg$ can climbs on rope without making block move is:

Sand is deposited at a uniform rate of $20\ kg/s$ and with negligible kinetic energy on an empty conveyor belt moving horizontally at a constant speed of $10$ meters per minute. Find the force required to maintain constant velocity of the conveyor belt.

Two capillary tubes $ P$ and $Q$ are dipped in water. The height of water level in capillary $P$ is $2/3$ to the height in $Q$ capillary. The ratio of their diameters is

In the absence of external torque for a body revolving about any axis the quantity that remains constant is

Which of the following system of units is not based on units of mass, length and time alone

A water-proof laser pointer of length $10 \,cm$ placed in a water tank rotates about a horizontal axis passing through its centre of mass in a vertical plane as shown in the figure. The time period of rotation is $60 \,s$. Assuming the water to be still and no reflections from the surface of the tank, the duration for which the light beam escapes the tank in one time period is close to ............. $s$ (Take, refractive index of water $=1.33$ )

A thermally insulating cylinder has a thermally insulating and frictionless movable partition in the middle, as shown in the figure below. On each side of the partition, there is one mole of an ideal gas, with specific heat at constant volume, $C_v=2 R$. Here, $R$ is the gas constant. Initially, each side has a volume $V_0$ and temperature $T_0$. The left side has an electric heater, which is turned on at very low power to transfer heat $Q$ to the gas on the left side. As a result the partition moves slowly towards the right reducing the right side volume to $V_0 / 2$. Consequently, the gas temperatures on the left and the right sides become $T_L$ and $T_R$, respectively. Ignore the changes in the temperatures of the cylinder, heater and the partition.

($1$) The value of $\frac{T_R}{T_0}$ is

$(A)$ $\sqrt{2}$ $(B)$ $\sqrt{3}$ $(C)$ $2$ $(D)$ $3$

($2$) The value of $\frac{Q}{R T_0}$ is

$(A)$ $4(2 \sqrt{2}+1)$ $(B)$ $4(2 \sqrt{2}-1)$ $(C)$ $(5 \sqrt{2}+1)$ $(D)$ $(5 \sqrt{2}-1)$

Give the answer or qution ($1$) and ($2$)

Two identical capacitors are arranged as shown. Work function of plate $1$ is $\phi \ eV$ .The $emf$ of battery is $\frac{\phi }{e}$ . If energy of incident photon is $hv$ then maximum kinetic energy of $e^-$ reaching plate $2$ is

A $10 g$ bullet moving at $200 \,m / s$ stops after penetrating $5 \,cm$ of wooden plank. The average force exerted on the bullet will be .......... $N$