Explanation:
For electromagnetic waves E and B are always perpendicular to each other and perpendicular to the direction of propagation. The direction of propagation is the direction of E × B.
The direction of propagation of the wave is the direction of propagation of its energy and power.
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If two streams of protons move parallel to each other in the same direction, then they
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(a) Do not exert any force on each other |
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(b) Repel each other |
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(c) Attract each other |
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(d) Get rotated to be perpendicular to each other |
Which of the following statement is false
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(a) Heat produced in a conductor is proportional to its resistance |
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(b) Heat produced in a conductor is proportional to the square of the current |
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(c) Heat produced in a conductor is proportional to charge |
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(d) Heat produced in a conductor is proportional to the time for which current is passed |
The distance between the extreme points on the periphery of the mirror is called:
Complete the reaction 
(a) 
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(b) 
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(c) 
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(d) 
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If an electron jumps from 1st orbital to 3rd orbital, then it will
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(a) Absorb energy |
(b) Release energy |
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(c) No gain of energy |
(d) None of these |
If two bulbs of wattage 25 and 100 respectively each rated at 220 volt are connected in series with the supply of 440 volt, then which bulbs will fuse
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(a) 100 watt bulb |
(b) 25 watt bulb |
(c) None of them |
(d) Both of them |