Question
A capacitor is connected to an alternating-current source. Is there a magnetic field between the plates?
✓
Answer
When an alternating-current source is connected to a capacitor, the electric field between the plates of the capacitor keeps on changing with the applied voltage. Due to the changing electric field, a magnetic field exists in between the plates of the capacitor.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
A cell of emf 'E' and internal resistance 'r' is connected across a variable load resistor R. Draw the plots of the terminal voltage V versus (i) R and (ii) the current I.
It is found that when R = 4$\Omega$, the current is 1 A and when R is increased to 9$\Omega$, the current reduces to 0.5 A. Find the values of the emf E and internal resistance r.
→It is found that when R = 4$\Omega$, the current is 1 A and when R is increased to 9$\Omega$, the current reduces to 0.5 A. Find the values of the emf E and internal resistance r.
A semi-circular arc of radius 20cm carries a current of 10A. Calculate the magnitude of magnetic field at the centre of the arc.
Two identical tuning forks vibrating at the same frequency 256Hz are kept fixed at some distance apart. A listener runs between the forks at a speed of 3.0m/s so that he approaches one tuning fork and recedes from the other figure. Find the beat frequency observed by the listener. Speed of sound in air = 332ms/s.
A car moves with a speed of 54km/h towards a cliff. The horn of the car emits sound of frequency 400Hz at a speed of 3.35m/s.
- Find the wavelength of the sound emitted by the horn in front of the car.
- Find the wavelength of the wave reflected from the cliff.
- What frequency does a person sitting in the car hear for the reflected sound wave?
- How many beats does he hear in 10 seconds between the sound coming directly from the horn and that coming after the reflection?
Find the radius and energy of a He+ ion in the states (a) n = 1, (b) n = 4 and (c) n = 10.
Figure. shows three paths through which a gas can be taken from the state A to the state B. Calculate the work done by the gas in each of the three paths.
A horizontal straight wire 10 m long extending from east to west is falling with a speed of $5.0 ms^{-1}$, at right angles to the horizontal component of the earth's magnetic field, $0.30 \times 10^{-4} Wb m ^{-2}$.
a. What is the instantaneous value of the emf induced in the wire?
b. What is the direction of the emf?
c. Which end of the wire is at the higher electrical potential?
→a. What is the instantaneous value of the emf induced in the wire?
b. What is the direction of the emf?
c. Which end of the wire is at the higher electrical potential?
The wavelength of a probe is roughly a measure of the size of a structure that it can probe in some detail. The quark structure of protons and neutrons appears at the minute length-scale of 10–15 m or less. This structure was first probed in early 1970’s using high energy electron beams produced by a linear accelerator at Stanford, USA. Guess what might have been the order of energy of these electron beams. (Rest mass energy of electron = 0.511 MeV.)
A uniform slab of dimension 10cm × 10cm × 1cm is kept between two heat reservoirs at temperatures 10°C and 90°C. The larger surface areas touch the reservoirs. The thermal conductivity of the material is $ 0.80\text{wm}^{-1}{^{\circ}}\text{C}^{-1}.$ Find the amount of heat flowing through the slab per minute.
→You are given a circuit below. Write its truth table. Hence, identify the logic operation carried out by this circuit. Draw the logic symbol of the gate it corresponds to.
