Explanation:
The themions are get attracted towards the anode and accelerate towards the anode due to the potential difference between anode and cathode.
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A circular coil of radius R carries an electric current. The magnetic field due to the coil at a point on the axis of the coil located at a distance r from the centre of the coil, such that r >> R, varies as
|
(a) |
(b) |
(c) |
(d) |
A radioactive substance has an average life of 5 hours. In a time of 5 hours
|
(a) Half of the active nuclei decay |
(b) Less than half of the active nuclei decay |
|
(c) More than half of the active nuclei decay |
(d) All active nuclei decay |
A charged particle is suspended in equilibrium in a uniform vertical electric field of intensity 20000 V/m. If mass of the particle is 9.6 
, the charge on it and excess number of electrons on the particle are respectively (g = 
|
(a) 4.8 |
(b) 5.8 |
(c) 3.8 |
(d) 2.8 |
A conducting circular loop of radius r carries a constant current i. It is placed in a uniform magnetic field 
, such that is perpendicular to the plane of the loop. The magnetic force acting on the loop is
|
(a) ir |
(b) 2πri |
(c) Zero |
(d) πri |
Three bulbs of 40 W, 60 W, 100 W are arranged in series with 220 volt supply which bulb has minimum resistance
|
(a) 100 W |
(b) 40 W |
(c) 60 W |
(d) Equal in all bulbs |
When cathode rays (tube voltage ~ 10 kV) collide with the anode of high atomic weight then we get
|
(a) Positive rays |
(b) X-rays |
(c) Gamma rays |
(d) Canal rays |
A varying current in a coil changes from 10 amp to zero in 0.5 sec. If average EMF is induced in the coil is 220 volts, the self inductance of coil is
|
(a) 5 H |
(b) 10 H |
(c) 11 H |
(d) 12 H |
