A parallel plate capacitor with circular plates of radius 1 m has a capacitance of 1 nF. At t = 0, it is connected for charging in series with a resistor R = 1 M$\Omega$ across a 2V battery (as shown in the figure). Find the magnetic field at a point P, halfway between the centre and the periphery of the plates, after t = 10–3 s. (The charge on the capacitor at time t is (t) = CV[1 – exp (–t/$\tau$)], where the time constant $\tau$ is equal to CR.)

Subtopic:  Maxwell's Equations |
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A plane electromagnetic wave of frequency 25 MHz travels in free space along the x-direction. At a particular point in space and time, $$\vec{E_{0}}=6.3~ \hat{j}~V/m$$What is $$\vec{B_{0}}$$ at this point?

Subtopic:  Properties of EM Waves |
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The magnetic field in a plane electromagnetic wave is given by. The wavelength and frequency of the wave are respectively:

Subtopic:  Properties of EM Waves |
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The magnetic field in a plane electromagnetic wave is given by. The expression for the electric field is:

Subtopic:  Properties of EM Waves |
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Light with an energy flux of 18 W/cm2 falls on a non-reflecting surface at normal incidence. If the surface has an area of 20 cm2, what is the average force exerted on the surface during a 30 minute time span?

Subtopic:  Properties of EM Waves |
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Assume a bulb of efficiency 2.5% as a point source. The peak values of the electric field and magnetic field produced by the radiation coming from a 100W bulb at a distance of 3m are respectively:

Subtopic:  Properties of EM Waves |
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