Question:
An a. c. source is connected across a pure inductor. Which one of the following figures shows the correct phase relation between the current and e.m.f.?
An a. c. source is connected across a pure inductor. Which one of the following figures shows the correct phase relation between the current and e.m.f.?
Show Hint
In a pure inductor the current lags the emf by 90 degrees; phasors rotate anticlockwise.
Updated On: Nov 13, 2026
- D
- B
- A
- C
Show Solution
Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept
In a pure inductor \(e=L\dfrac{di}{dt}\), so the current lags the applied emf by \(\dfrac{\pi}{2}\).
Step 2: Phasor picture
Phasors rotate anticlockwise, so a phasor that lags is drawn \(90^{\circ}\) clockwise from the emf phasor.
Step 3: Check the figures
Figure A shows the two along the same line in opposite directions and figure C shows them in the same direction.\nFigure D shows the current ahead of the emf, while figure B shows the emf pointing right and the current pointing down, 90 degrees behind.
Final Answer:
Figure B shows the correct phase relation. \[ \boxed{\text{(B) }\text{B}} \]
In a pure inductor \(e=L\dfrac{di}{dt}\), so the current lags the applied emf by \(\dfrac{\pi}{2}\).
Step 2: Phasor picture
Phasors rotate anticlockwise, so a phasor that lags is drawn \(90^{\circ}\) clockwise from the emf phasor.
Step 3: Check the figures
Figure A shows the two along the same line in opposite directions and figure C shows them in the same direction.\nFigure D shows the current ahead of the emf, while figure B shows the emf pointing right and the current pointing down, 90 degrees behind.
Final Answer:
Figure B shows the correct phase relation. \[ \boxed{\text{(B) }\text{B}} \]
Was this answer helpful?
0
0
Top MHT CET Physics Questions
- In non uniform circular motion, the ratio of tangential to radial acceleration is (r = radius of circle, $v =$ speed of the particle, $\alpha =$ angular acceleration)
- A particle moves along a circle of radius ?$r$? with constant tangential acceleration. If the velocity of the particle is ?$?$? at the end of second revolution, after the revolution has started then the tangential acceleration is
- If $M_z$ = magnetization of a paramagnetic sample, $B$ = external magnetic field, $T$ = absolute temperature, $C$ = curie constant then according to Curie�s law in magnetism, the correct relation is
- In a fundamental mode, the time required for the sound wave to reach upto the closed end of a pipe filled with air is $'t'$ second. The frequency of vibration of air column is
- In a parallel plate capacitor, the capacity increases if
View More Questions
Top MHT CET Phasor diagrams Questions
- When a.c. source is connected across a pure capacitor, the correct phase relation between current and emf is shown in figure.
- When a.c. source is connected across a resistance, the correct phasor relation between the current (\(i_{R}\)) and emf (\(e_{R}\)) is shown in figure
- Which phasor diagram represents LCR circuit at resonance?
- In an LCR series circuit, a. c. voltage source is connected in series. When L is removed from the circuit, the phase difference between the voltage and the current is \(\pi /3\). If instead C is removed, the phase difference is again \(\pi /3\). The power factor of the circuit is \(\left(\tan \frac{\pi }{3}=\sqrt{3}\right)\)
- The correct phasor diagram for an a.c. circuit containing only pure capacitor.
Top MHT CET Questions
- During r- DNA technology, which one of the following enzymes is used for cleaving DNA molecule ?
- In non uniform circular motion, the ratio of tangential to radial acceleration is (r = radius of circle, $v =$ speed of the particle, $\alpha =$ angular acceleration)
- The temperature of $32^{\circ}C$ is equivalent to
- The line $5x + y - 1 = 0$ coincides with one of the lines given by $5x^2 + xy - kx - 2y + 2 = 0 $ then the value of k is
- The heat of formation of water is $ 260\, kJ $ . How much $ H_2O $ is decomposed by $ 130\, kJ $ of heat ?
View More Questions