Find the electron density when convection current density is 120 units and the velocity is 5m/s.

A)
12
B)
24
C)
600
D)
720

Correct Answer : Option (B) :   24

Explanation : The convection current density is given by J = ρe x v. To get ρe, put J = 120 and v = 5. ρe = 120/5 = 24 units.

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Radiation intensity in a given direction is the
A)
Energy radiated per square metre
B)
Power radiated per square metre
C)
Power radiated per unit solid angle in that direction
D)
None of the above

Correct Answer :   Power radiated per unit solid angle in that direction

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A)
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B)
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C)
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D)
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A)
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D)
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