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
Define coefficient of mutual induction i.e. mutual inductance.
When the current in a primary coil is changed from zero to 2.0 A within 300 ms, then an induced emf of a 0.80 volt is produced in secondary coil. Calculate coefficient of mutual inductance between the two coils.
When the current in a primary coil is changed from zero to 2.0 A within 300 ms, then an induced emf of a 0.80 volt is produced in secondary coil. Calculate coefficient of mutual inductance between the two coils.
A ball of superconducting material is dipped in liquid nitrogen and placed near a bar magnet.
- In which direction will it move?
- What will be the direction of it’s magnetic moment?
A block weighing 10N travels down a smooth curved track AB joined to a rough horizontal surface (figure). The rough surface has a friction coefficient of 0.20 with the block. If the block starts slipping on the track from a point 1.0m above the horizontal surface, how far will it move on the rough surface?
Write and explain principle of superposition for stationary electric forces.
In a photoelectric experiment, the collector plate is at 2.0V with respect to the emitter plate made of copper ($\phi$ - 4.5eV). The emitter is illuminated by a source of monochromatic light of wavelength 200 run. Find the minimum and maximum kinetic energy of the photoelectrons reaching the collector.
→A resistor of $200 \Omega$ and a capacitor of $15.0 \mu F$ are connected in series to a $220 V , 50 Hz$ ac source. (a) Calculate the current in the circuit; (b) Calculate the voltage (rms) across the resistor and the capacitor. Is the algebraic sum of these voltages more than the source voltage? If yes, resolve the paradox.
→"Write ampere's circuital law. In a long straight wire of cross-sectional cut (radius a), a direct current is flowing in the wire. Current is uniformly distributed in the wire. Calculate the magnetic field in inner surface of the wire ( $r
→A thin spherical shell lying on a rough horizontal surface is hit by a cue in such a way that the line of action passes through the centre of the shell. As a result, the shell starts moving with a linear speed v without any initial angular velocity. Find the linear speed of the shell after it starts pure rolling on the surface.
Repeat the previous exercise if the angle between each pair of springs is 120° initially.
The figure shows experimental set up of a meter bridge. When the two unknown resistances X and Y are inserted, the null point D is obtained 40 cm from the end A. When a resistance of 10 Ω is connected in series with X, the null point shifts by 10 cm. Find the position of the null point when the 10 Ω resistance is instead connected in series with resistance ‘Y’. Determine the values of the resistances X and Y.