Resistance per unit length of the wire
Ohms law: the electric current flowing through a conductor is directly proportional to the the potential difference applied across the ends of the conductor when temperature and other physical conditions remain constant.
6 trials
Specific resistance of the wire
Ohms law: the electric current flowing through a conductor is directly proportional to the potential difference across the ends of the conductor when temperature and other physical conditions remain constant
Figure of merit
Deflection in a galvanometer is directly proportional to the current flowing through it
Conversion of galvanometer to ammeter
Galvanometer can be converted into ammeter by connection suitable resistance in parallel with it
Conversion of galvanometer into voltmeter
A galvanometer can be converted into voltmeter by connecting a suitable high resistance in series with it
Frequency of alternating current
At resonance, the frequency of alternating current is equal to half of frequency of vibration of the stretched string
Focal length of concave mirror
Focal length is the distance between the pole and principal focus of the concave mirror. The object distance must be greater than the focal length to get a real and inverted image.
Focal length of convex lens
Focal length is the distance between the optical centre and principal focus of the convex lens. The object distance must,urs be greater than focal length of the convex lens
Angle of minimum deviation
The angle of minimum deviation is the angle between the incident ray and the emergent ray. At minimum deviation, the light ray passes through the prism symmetrically.
Hence angle of emergence = angle of incidence
Refractive index of glass slab
The refractive index of glass slab with respect to air is the ratio of real depth to the apparent depth.
Refractive index of water using convex lens
- The rays of light from object incident normally on the plane mirror, retrace their paths so that the image of the object forms by the side of the object
- It is based on the relation between radii of curvature of equiconvex lens and effective focal length of the glass and water lenses
Refractive index of water using concave mirror
- The rays of light from the object incident normally on the concave mirror, retrace their paths so that image of the object forms by the side of the object.
- The bottom of the concave mirror containing water, appears to be raised up because of refraction of light through water.
Semiconductor diode
When the diode is forward biased, it conducts and offers very low resistance. Cut-in voltage is the characteristic voltage at which diode current increases exponentially even for a small increase in bias voltage, when diode is forward biased.
