A potential difference of V volt is applied across a copper wire of length I and diameter d. How will the drift velocity be affected if
(i) V is double (ii) I is doubled.
(i) just when the switch S is closed.
(ii) when sufficient time has elapsed after closing the switch.
(i)
When switch S is closed, inductor offers large resistance, hence no current flows through inductor.
Total resistance,
R =2 + 4 + 6= 12 Ω
V = 8V
i.e.,
ii)
When DC becomes steady, resistance of inductor becomes zero, so no current flows through 2 π.
R = 4 + 6= 10 Ω,
V = 8 V
Microwaves, X-rays, U.V. rays, infrared rays.
Which of the above electromagnetic waves has—
(i) the shortest wavelength.
(ii) the lowest frequency.
In a single slit diffraction pattern how does the angular width of central maximum change, when
(i) the slit width is increased.
(ii) light of smaller wavelength is used.