Physics
According to the NEW colour convention which colour of wire is connected to :
(a) the metal body of the appliance
(b) the switch of the appliance?
Related Questions
The displacement–time graph of a sound wave produced by a vibrating wire is shown below.
(a) How will you adjust the tension in the wire, to reduce the length of PR?
(b) Which characteristic of sound is affected by the reduction in the length of PR?
A ray of light enters a rectangular glass slab submerged in water at an angle of incidence 55°. Does this ray undergo total internal reflection when it moves from water to glass? Justify your answer. (The critical angle for glass–water interface is 54°)
(a) Which of the two, alternating current or direct current, produces a varying magnetic field when it flows through a conductor?
(b) State the frequency of the alternating current supply in India
Calculate the amount of heat absorbed by 200 g of paraffin wax to melt completely at its melting point.
[Specific latent heat of fusion of paraffin wax = 146 Jg⁻¹]