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JEE Advanced 2021 Paper 2
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© examsnet.com
Question : 4
Total: 57
A physical quantity
S
is defined as
S
=
(
E
×
B
)
∕
µ
0
, where
→
E
is electric field,
B
is magnetic field and
µ
0
is the permeability of free space. The dimensions of
S
are the same as the dimensions of which of the following quantities?
Energy
Charge
×
Current
Force
Length
×
Time
Energy
Volume
Power
Area
Validate
Solution:
Given physical quantity,
→
S
=
[
→
E
×
→
B
]
1
µ
0
Here
S
is known as pointing vector and it represents flow of energy per unit area per unit time
→
S
=
Energy
Area
×
Time
=
Power
Area
=
Force
Length
×
Time
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