Assertion: The magnetic poles of earth do not coincide with the geographic poles.
Reason: The discrepancy between the orientation of a compass and true north-south direction is known as magnetic declination.
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 the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Assertion: Electromagnetic waves are transverse in nature
Reason: The electric and magnetic fields of an e.m. wave are perpendicular to each other and also perpendicular to the direction of wave propogation.
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 the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
A.
If both assertion and reason are true and reason is the correct explanation of assertion.
Transverse nature of the electromagnenetic wave, electric and magnetic field vectors are perpendicular to the direction of propagation of wave. This nature of electromagnetic wave is known as Transverse nature.
The magnetic field of the electromagnetic wave is perpendicular to the electric field and has a magnitude Brad = Erad/ c. For electromagnetic waves E and B are always perpendicular to each other anfd perpendicular to the direction of propagation, The direction of propagation is the direction of E × B.
Assertion: If a proton and an a-particle enter a uniform magnetic field perpendicularly with the same speed, the time period of revolution of a particle is double that of proton.
Reason: In a magnetic field, the period of revolution of a charged particle is directly proportional to the mass of the particle and is inversely proportional to charge of particle.
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 the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false.
Assertion: It is advantageous to transmit electric power at high voltage.
Reason: High voltage implies high current.
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 the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false
Assertion: X-ray astronomy is possible only from satellites orbiting the earth.
Reason: Efficiency of X-rays telescope is large as compared to any other telescope.
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 the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false
Transmission lines transmit a voltage of V volt to our houses from power stations, then the power P supplied by them is proportional to
V
V2
For a person near point of vision is 100 cm. Then the power of lens he must wear so as to have normal vision, should be
+ 1D
D
+ 3D
D
What would be maximum wavelength for Brackett series of hydrogen-spectrum?
74589 Ao
22790 Ao
40519 Ao
18753 Ao