Two parallel plates have equal and opposite charge. When the space between them is evacuated, the electric field between the plates is 2 
. When the space is filled with dielectric, the electric field becomes 1 . The dielectric constant of the dielectric material
|
(a) 1/2 |
(b) 1 |
(c) 2 |
(d) 3 |
(c) 2
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Which of the following statements are true regarding Bohr's model of hydrogen atom
(I) Orbiting speed of electron decreases as it shifts to discrete orbits away from the nucleus
(II) Radii of allowed orbits of electron are proportional to the principal quantum number
(III) Frequency with which electrons orbits around the nucleus in discrete orbits is inversely proportional to the principal quantum number
(IV) Binding force with which the electron is bound to the nucleus increases as it shifts to outer orbits Select correct answer using the codes given below
Codes :
|
(a) I and III |
(b) II and IV |
(c) I, II and III |
(d) II, III and IV |
According to Gauss’ Theorem, electric field of an infinitely long straight wire is proportional to
|
(a) r |
(b) |
(c) |
(d) |
In a coil of self inductance 0.5 henry, the current varies at a constant rate from zero to 10 amperes in 2 seconds. The e.m.f. generated in the coil is
|
(a) 10 volts |
(b) 5 volts |
(c) 2.5 volts |
(d) 1.25 volts |
Diode is used as a/an
|
(a) Oscillator |
(b) Amplifier |
(c) Rectifier |
(d) Modulator |
At ordinary temperatures, the electrical conductivity of semi conductors in mho/meter is in the range
|
(a) |
(b) |
(c) |
(d) |
