Question
Write Fleming's left hand rule.
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Think over the experiment number 2 of Faraday and Henry and tell :
(a) What will you do to obtain more deflection in the galvanometer?
(b) How will you show the presence of current in the absence of a galvanometer?
(a) What will you do to obtain more deflection in the galvanometer?
(b) How will you show the presence of current in the absence of a galvanometer?
An electric current of 5 A is flowing through a wire of area of cross-section $4 \times 10^{-6} m^2$. If the number density of charge carriers (free electrons) is $5 \times 10^{26}$ $m ^{-3}$. Find the drift velocity of the electrons.
→- Monochromatic light of frequency $6.0 \times 10^{14 }Hz$ is produced by a laser. The power emitted is $2.0 \times 10^{-3} W.$ Estimate the number of photons emitted per second on an average by the source.
- Draw a plot showing the variation of photoelectric current versus the intensity of incident radiation on a given photosensitive surface.
Write an expression for resistance and resistivity of a conductor in terms of number of free electrons per unit volume and relaxation time.
For a given light sensitive material and a source of incident radiation of fixed frequency, how does the photoelectric current decay with the intensity of incident light?
A thin spherical shell having uniform density is cut in two parts by a plane and kept separated as shown in figure $(11-E_3).$ The point $A$ is the centre of the plane section of the first part and $B$ is the centre of the plane section of the second part. Show that the gravitational field at $A$ due to the first part is equal in magnitude to the gravitational field at $B$ due to the second part.
→A particle moves on a given straight line with a constant speed v. At a certain time it is at a point P on its straight line path. O is a fixed point. Show that $\overrightarrow{\text{OP}}\times\overrightarrow{\text{v}}$ is independent of the position P.
→A staircase contains three steps each 10cm high and 20cm wide (figure). What should be the minimum horizontal velocity of a ball rolling off the uppermost plane so as to hit directly the lowest plane?
A wire-loop confined in a plane is rotated in its own plane with some angular velocity. A uniform magnetic field exists in the region. Find the emf induced in the loop.
An electron moves in a circular orbit $6^{15} \times 10^{15}$ times per second. Find the magnitude of current in the loop.
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