CBSE physics
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Does the charge given to a metallic sphere depend on whether it is hollow or solid? Give a reason for your answer.
No, Because the charge resides only on the surface of the conductor.
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A long straight current carrying wire passes normally through the centre of the circular loop. If the current through the wire increases, will the be an induced emf in the loop? Justify
No, Magnetic flux does not change with the change of current.
At a place, the horizontal component of earth's magnetic field is B and angle of dip are 60o. What is the value of a horizontal component of the earth's magnetic field at the equator?
The horizontal component of the electric field is given by
BH = Becos(θ)
where θ is the angle of dip at the given place
Be is teh net magnetic field
At θ = 60o
BH = Be cos(60) = Be x (1/2)
Be = 2BH = 2B (given BH =B)
Now horizontal component at equator
BH = Becos (θ)
angle of dip at equator is 0
BH = Becos(0) = Be = 2B
BH = 2B
How is the speed of em-waves in vacuum determined by the electric and magnetic field?
The speed of the em-waves in a vacuum is determined by the ratio of the peak value of electric and magnetic fields.
c =E0/B0
How does Ampere-Maxwell law explain the flow of current through a capacitor when it is being charged by a battery? Write the expression for the displacement current in terms of the rate of change of electric flux.
During charging, electric flux between the plates of capacitor keeps on
changing; this results in the production of a displacement current
between the plates.
Expression for the displacement current
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Mock Test Series
Mock Test Series