Explanation:
Magnetic force acts on a charged particle, due to which it deflects from its path. The magnitude of this force is measured as $\Big|\overrightarrow{\text{F}}\Big|=\Big|\text{q}\Big(\overrightarrow{\text{v}}\times\overrightarrow{\text{B}}\Big)\Big|.$
Here, q is the charge on the particle that is moving with speed v in a uniform magnetic field B.
Since alpha, beta-plus and beta-minus are charged particles, they suffer deflection due to the field applied. On the other hand, gamma rays are photons and due to zero charge, they do not suffer any deflection.
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The most penetrating radiation out of the following is
| (a) X-rays | (b) β -rays |
(c) α - particles |
(d) γ - rays |
The capacitance of a parallel plate capacitor is 12μF. If the distance between the plates is doubled and area is halved, then new capacitance will be
|
(a) 8μF |
(b) 6μF |
(c) 4μF |
(d) 3μF |
Which of the energy band diagrams shown in the figure corresponds to that of a semiconductor
|
(a)
|
(b)
|
(c)
|
(d)
|
An electron is moving with constant velocity along x - axis. If a uniform electric field is applied along y- axis, then its path in the x - y plane will be
|
(a) A straight line |
(b) A circle |
(c) A parabola |
(d) An ellipse |
In the nuclear reaction 
, the values of A and Z are
|
(a) A = 234, Z = 94 |
(b) A = 234, Z = 90 |
(c) A = 238, Z = 94 |
(d) A = 238, Z = 90 |
Two parallel plates separated by a distance of 5mm are kept at a potential difference of 50 V. A particle of mass 
and charge 
enters in it with a velocity 
. The acceleration of the particle will be
|
(a) |
(b) |
(c) |
(d) 2 |
Assertion : The lightening conductor at the top of high building has sharp pointed ends.
Reason : The surface density of charge at sharp points is very high resulting in setting up of electric wind.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |
Atomic mass number of an element thorium is 232 and its atomic number is 90. The end product of this radioactive element is an isotope of lead (atomic mass 208 and atomic number 82). The number of alpha and beta particles emitted is
|
(a) α = 3, β = 3 |
(b) α = 6, β = 4 |
(c) α = 6, β = 0 |
(d) α = 4, β = 6 |
