Explanation:
The current that flows from a point at the lower (negative) potential to a point at higher (positive) potential is called electronic current. Electronic current is produced by the movement of negatively charged electrons.
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A circular current carrying coil has a radius R. The distance from the centre of the coil on the axis where the magnetic induction will be 
to its value at the centre of the coil, is
|
(a) |
(b) R |
(c) 2 |
(d) |
Two equal charges q are placed at a distance of 2a and a third charge -2q is placed at the midpoint. The potential energy of the system is
|
(a) |
(b) |
(c) |
(d) |
Yellow light is used in single slit diffraction experiment with slit width 0.6 mm. If yellow light is replaced by X-rays then the pattern will reveal
|
(a) That the central maxima is narrower |
(b) No diffraction pattern |
|
(c) More number of fringes |
(d) Less number of fringes |
The most penetrating radiation out of the following is
| (a) X-rays | (b) β -rays |
(c) α - particles |
(d) γ - rays |
Two bulbs of 500 watt and 200 watt are manufactured to operate on 220 volt line. The ratio of heat produced in 500 W and 200 W, in two cases, when firstly they are joined in parallel and secondly in series, will be
|
(a) |
(b) |
(c) |
(d) |
If the binding energy of the electron in a hydrogen atom is 13.6 eV, the energy required to remove the electron from the first excited state of 
is
|
(a) 122.4 eV |
(b) 30.6 eV |
(c) 13.6 eV |
(d) 3.4 eV |
A and B are two radioactive substances whose half lives are 1 and 2 years respectively. Initially 10 gm of A and 1 gm of B is taken. The time (approximate) after which they will have same quantity remaining is
|
(a) 6.62 years |
(b) 5 years |
(c) 3.2 years |
(d) 7 years |
An electron is revolving round a proton, producing a magnetic field of 16 weber/m2 in a circular orbit of radius 1Å. It’s angular velocity will be
|
(a) 1017 rad/sec |
(b) 1/2 π × 1012 rad/sec |
|
(c) 2π × 1012 rad/sec |
(d) 4 π × 1012 rad/sec |
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