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A square shaped current loop of side len...

A square shaped current loop of side length L and carrying current I lies in a uniform magnetic field B acting perpendicular to the plane of squre loop and directed inward. The net magnetic force acting on current loop is

A

lBL

B

4 lBL

C

zero

D

2lBL

Text Solution

Verified by Experts

The correct Answer is:
C
Let the current is flowing in anti-clockwise direction as shown in figure.

Now, magnetic force on `AD=F_(1)=ilB` inwards (By Fleming’s left hand rule).
Similarly, magnetic force on `BC=F_(2)=ilB` inwards
Since two forces are equal in magnitude and opposite in direction, therefore, they cancel out each other.
Also, magnetic force on `CD=F_(3)=ilB` inwards (By Fleming’s left hand rule)
Similarly, magnetic force on `AB=F_(4)=ilB` inwards
Again, two forces are equal in magnitude and opposite in direction, therefore, they cancel out each other.
So, the net force on the current loop is 0.
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Knowledge Check

  • A current carrying loop in a uniform magnetic field will experience

    A
    force only
    B
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    C
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  • A conducting circular loop of radius r carries a constant current i. It is placed in a uniform magnetic field B such that B is perpendicular to the plane of the loop. The magnetic force acting on the loop is

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    zero
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    ir B
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  • Torque acting on a current loop in a uniform magnetic field is equal to

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