A proton and an α - particle enter a uniform magnetic field perpendicularly with the same speed. If proton takes 25 μ sec to make 5 revolutions, then the periodic time for the α - particle would be
|
(a) 50 μ sec |
(b) 25 μ sec |
(c) 10 μ sec |
(d) 5 μ sec |
(c) 10 μ sec
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There are 8 equal resistances R. Two are connected in parallel, such four groups are connected in series, the total resistance of the system will be
|
(a) R / 2 |
(b) 2 R |
(c) 4 R |
(d) 8 R |
$\frac{\omega\text{M}}{\text{M}+\text{m}}$
$\frac{\omega\text{M}}{\text{M}+\text{2m}}$
$\frac{\omega(\text{M}-\text{2m})}{\text{M}+\text{2m}}$
$\frac{\omega(\text{M}+\text{2m})}{\text{M}}$
Two similar bar magnets P and Q, each of magnetic moment M, are taken, If P is cut along its axial line and Q is cut along its equatorial line, all the four pieces obtained have
|
(a) Equal pole strength |
(b) Magnetic moment |
|
(c) Magnetic moment |
(d) Magnetic moment M |
In a potentiometer circuit there is a cell of e.m.f. 2 volt, a resistance of 5 ohm and a wire of uniform thickness of length 1000 cm and resistance 15 ohm. The potential gradient in the wire is
|
(a) |
(b) |
(c) |
(d) |
The figure illustrate how B, the flux density inside a sample of unmagnetised ferromagnetic material varies with B0, the magnetic flux density in which the sample is kept. For the sample to be suitable for making a permanent magnet
|
(a) OQ should be large, OR should be small |
|
(b) OQ and OR should both be large |
|
(c) OQ should be small and OR should be large |
|
(d) OQ and OR should both be small |
