A straight wire of length 
carrying a current of 
is suspended in mid-air by a uniform magnetic field of 
(as shown in figure). The mass of the wire is 
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
C
Magnetic field 
exerts force on straight wire given by 
It is clear from the above expression that this force will act vertically upwards.
For mid-air suspension, this must be balanced by the force due to gravity.
Weight of wire 
force exerted by magnetic field. 
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