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 heat produced by a 100 watt heater in 2 minute will be equal to
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(a) 12 |
(b) 10 |
(c) 6 |
(d) 3 |
An object is immersed in a fluid. In order that the object becomes invisible, it should
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(a) Behave as a perfect reflector |
|
(b) Absorb all light falling on it |
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(c) Have refractive index one |
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(d) Have refractive index exactly matching with that of the surrounding fluid |
If 96500 coulombs of electricity liberates one gram equivalent of any substance, the time taken for a current of 0.15 amperes to deposite 20mg of copper from a solution of copper sulphate is (Chemical equivalent of copper = 32)
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(a) 5 min 20 sec |
(b) 6 min 42 sec |
(c) 4 min 40 sec |
(d) 5 min 50 sec |
When current flows through a conductor, then the order of drift velocity of electrons will be
|
(a) |
(b) |
(c) |
(d) |
A charge (-q) and another charge (+Q) are kept at two points A and B respectively. Keeping the charge (+Q) fixed at B, the charge (-q) at A is moved to another point C such that ABC forms an equilateral triangle of side l. The net work done in moving the charge (-q) is
|
(a) |
(b) |
(c) |
(d) Zero |
The sun revolves around the galaxy with a speed of 250 km/sec and it's radius is 3 × 104 light year. The mass of the milky way is
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(a) 3 × 1040 kg |
(b) 3 × 1041 kg |
(c) 5 × 1040 kg |
(d) 6 × 1041 kg |
