When a positively charged particle enters into a uniform magnetic field with uniform velocity, its trajectory can be
(i) a straight line (ii) a circle (iii) a helix
(i) only
(i) or (ii)
(i) or (iii)
any one of (i), (ii) and (iii)
D.
any one of (i), (ii) and (iii)
We assume here that we are in a vacuum. ( constant velocity)
the angle of the path of the particle to the lines magnetic field is important.
The proton will travel in a circular pattern for ever and ever. The circle described by the particle will be 90 deg to the direction of magnetic field lines. The proton will continue in straight line. The path of the proton is exactly in the direction of the lines of magnetic field.
Assertion: Gauss's law can't be used to calculate electric field near electric an electric dipole.
Reason: Electric dipole don't have symmetrical charge distribution.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not correct explaination of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Assertion: Magnetic field lines are continuous and closed.
Reason: Magnetic monopole does not exist.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Assertion: Magnetic force between two short magnets, when they are co-axial follows inverse square law of distance.
Reason: The magnetic forces between two poles do not follow inverse square law of distance.
If both assertion and reason are true and reaon is correct explanation of assertion.
If both assertion and reason are true and reaon is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
In an interference, the intensity of two interfering waves are I and 4I respectively. They produce intensity at two points A and B with phase angle of and respectively. Then difference in between them is
I
2 I
4 I
5 I
In a single slit diffraction with k = 500 nm and lens of diameter 0.1 mm then width of central maxima, obtain on screen at a distance of 1 m will be
5 mm
1 mm
10 mm
2.5 mm
Voltage of modulating wave of 5 V with 10 MHz frequency was superimposed on carrier wave of frequency 20 MHz and voltage 20 V then the modulation index is
0.25
1.25
2.43
64.0
If we assume kinetic energy of a proton is equal to energy of the photon, the ratio of de Broglie wavelength of proton to photon is proportional to
E
E-1/2
E1/2
E3/2