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12th Gujarat Board
IMPORTANT
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The magnetic field between the plate of a capacitor when r<R is given by

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Important Questions on Electromagnetic Waves

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12th Gujarat Board
IMPORTANT

The figure shows a capacitor made of two circular plates each of radius 12 cm, and separated by 5 cm. The capacitor is being charged by an external source. The charging current is constant and is equal to 0.15 A, obtain the displacement current across the plates?

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HARD
12th Gujarat Board
IMPORTANT
Figure shows a capacitor made of two circular plates each of radius 12 cm and separated by 5.0 cm. The capacitor is being charged by an external source (not shown in the figure). The charging current is constant and equal to 0.15 A.
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Calculate the capacitance and the rate of charge of potential difference between the plates.
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12th Gujarat Board
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A parallel plate capacitor made of circular plates each of radius R=6.0 cm has a capacitance C=100 pF. The capacitor is connected to a 230 V ac supply with an (angular) frequency of 300 rads-1. Is the conduction current equal to the displacement current?

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EASY
12th Gujarat Board
IMPORTANT
Which among the following does not represent Maxwell’s equation?
MEDIUM
12th Gujarat Board
IMPORTANT
Given here is some famous number associated with electromagnetic radiations in different contexts in physics. State the part of the electromagnetic spectrum to which it belongs,14.4 keV [energy of a particular transition in 57Fe nucleus associated with a famous high-resolution spectroscopic method (Mossbauer spectroscopy)]. 
 
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12th Gujarat Board
IMPORTANT
Answer the following question: Long distance radio broadcasts use short - wave bands. Why? 
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12th Gujarat Board
IMPORTANT
Optical and radio telescopes are built on the ground, but X-ray astronomy is possible only from satellites orbiting the earth. Why?
MEDIUM
12th Gujarat Board
IMPORTANT
The small ozone layer on top of the stratosphere is crucial for human survival. Why?