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 plane faces of two identical plano-convex lenses each having focal length of 40 cm are pressed against each other to form a usual convex lens. The distance from this lens, at which an object must be placed to obtain a real, inverted image with magnification one is
|
(a) 80 cm |
(b) 40 cm |
(c) 20 cm |
(d) 162 cm |
A diode is connected to 220 V (rms) ac in series with a capacitor as shown in figure. The voltage across the capacitor is
|
(a) 220 V |
(b) 110 V |
(c) 311.1 V |
(d) |
When a piece of aluminium wire of finite length is drawn through a series of dies to reduce its diameter to half its original value, its resistance will become
|
(a) Two times |
(b) Four times |
(c) Eight times |
(d) Sixteen times |
