JEE Advanced | 2015Magnetic field due to currentHard
Question
A conductor (shown in the figure) carrying constant current I is kept in the x-y plane in a unfirom magnetic field 
. If F is the magnitude of the total magnetic force acting on the conductor, then the correct statement(s) is (are)
. If F is the magnitude of the total magnetic force acting on the conductor, then the correct statement(s) is (are)Options
A.If 
is along 
, F ∝ (L + R)
is along , F ∝ (L + R)B.If is along 
, F = 0
is along , F = 0C.If is along 
, F ∝ (L + R)
is along , F ∝ (L + R)D.If is along 
, F = 0
is along , F = 0Solution
as magnetic field is uniform
= I (2L + 2R)
When B is along y or z axis
F ∝ (L + R)
When B is along x-axis
F = 0
∴ (A,B,C)
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