A parallel plate capacitor of area A, plate separation d and capacitance C is filled with three different dielectric materials having dielectric constants 
and 
as shown. If a single dielectric material is to be used to have the same capacitance C in this capacitor, then its dielectric constant k is given by
(a) 
|
(b) 
|
|
(c) k = |
(d) |
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The condition for observing Fraunhofer diffraction from a single slit is that the light wavefront incident on the slit should be
|
(a) Spherical |
(b) Cylindrical |
(c) Plane |
(d) Elliptical |
Which of the following statements is incorrect about hysteresis
|
(a) This effect is common to all ferromagnetic substances |
|
(b) The hysteresis loop area is proportional to the thermal energy developed per unit volume of the material |
|
(c) The hysteresis loop area is independent of the thermal energy developed per unit volume of the material |
|
(d) The shape of the hysteresis loop is characteristic of the material |
Two condensers of capacities 2C and C are joined in parallel and charged upto potential V. The battery is removed and the condenser of capacity C is filled completely with a medium of dielectric constant K. The p.d. across the capacitors will now be
|
(a) |
(b) |
(c) |
(d) |
A coil of wire of a certain radius has 600 turns and a self inductance of 108 mH. The self inductance of a 2nd similar coil of 500 turns will be
|
(a) 74 mH |
(b) 75 mH |
(c) 76 mH |
(d) 77 mH |
Thermal neutrons can cause fission in
|
(a) |
(b) |
(c) |
(d) |
