While a capacitor remains connected to a battery and dielectric slab is applied between the plates, then
|
(a) Potential difference between the plates is changed |
(b) Charge flows from the battery to the capacitor |
|
(c) Electric field between the plates increases |
(d) Energy store in the capacitor decreases |
(b) Charge flows from the battery to the capacitor
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A double convex lens is made of glass of refractive index 1.5. If its focal length is 30 cm, then radius of curvature of each of its curved surface is
|
(a) 10 cm |
(b) 15 cm |
(c) 18 cm |
(d) None of these |
In a junction diode, the holes are due to
| (a) Protons | (b) Neutrons | (c) Extra electrons | (d) Missing of electrons |
A constant voltage is applied between the two ends of a metallic wire. If both the length and the radius of the wire are doubled, the rate of heat developed in the wire
|
(a) Will be doubled |
(b) Will be halved |
|
(c) Will remain the same |
(d) Will be quadrupled |
A circular coil of radius 4 cm and of 20 turns carries a current of 3 amperes. It is placed in a magnetic field of intensity of 0.5 
. The magnetic dipole moment of the coil is
|
(a) 0.15 |
(b) 0.3 |
(c) 0.45 
|
(d) 0.6
|
The stopping potential (
versus frequency (n) plot of a substance is shown in figure the threshold wave length is
|
(a) 5 |
(b) 6000Å |
|
(c) 5000 Å |
(d) Can not be estimated from given data |
