Short Answer Type
, where p is the dipole moment.
Let a dipole of dipole moment P = q x 2l, be placed in uniform electric field E at an angle θ.
Two equal, opposite and parallel force acts on the dipole.
These forces form a couple and moment of couple gives torque.
Torque = Force x Perpendicular digit
= qE x BC
= qE x 2l sin θ
= (q x 2l) x E sin θ
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.
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.
Switch
