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The magnetic field of a long solenoid resembles that of a bar magnet — it has a north and south pole and similar field line patterns.
· Kirchhoff’s Current Law (KCL): Total current entering a junction = total current leaving.· Kirchhoff’s Voltage Law (KVL): Algebraic sum of all potential differences in a closed loop is zero. Used i...
· Two fundamental laws govern reflection.The angle of incidence (I) equals the angle of reflection (r).At the point of incidence, the incident ray, reflected ray, and the normal to the reflecting surface lie i...
The convex lens's focal length cannot be reduced by a more significant amount. This is because making lenses having tiny focal lengths is not easy. Spherical and chromatic aberrations are created by a convex le...
Yes, the angular magnification varies. When the length between the eye and a magnifying glass rises, the angular magnification reduces slightly because the subtended angle at the eye is imperceptibly less than the le...
Though the image size is larger than the object, the angular size of the image is equivalent to the angular size of the object. A magnifying glass supports one seeing the objects closer than the least distance of dist...
As the choke coil reduces the voltage across the tube without wasting much power, it is used in the fluorescent tubes with ac mains. An ordinary resistor cannot be used instead of choke coil because it wastes power in...
When an iron core is inserted in the choke coil (which is in series with a lamp connected to an ac line), the lamp will glow dimly. This is because the choke coil and the iron core increase the impedance of the cir...
The dc signal will appear across capacitor C because for dc signals, the impedance of an inductor L is negligible while the impedance of a capacitor C is very high (almost infinite).Therefore, a dc signal appears acr...
Yes, a capacitor is used in the primary circuit of an induction coil. This is because, when the circuit is broken, a high induced voltage is used to charge the capacitor to avoid sparks.
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