Asked by Dewanshi Rajput · 5 years ago
A circular loop of radius R carrying a current I is placed in uniform magnetic field B perpendicular to the loop .The force on the loop is : Ans : zero Explain why? I didn't get that
A closed current-carrying loop when placed in a uniform magnetic field always experiences no net force.
The Force experienced by the loop is the cross product of the magnetic field and magnetic moment. Since both are parallel in this case, the force acting on the loop will be zero.
Aditi Ghuge · 5 years ago
But here theta is of 90 bcz it is said that they are perpendicular to each other
Dewanshi Rajput · 5 years ago
Sorry I thought that is parallel but in both cases answer is zero Here's the explanation The magnetic field is perpendicular to the plane of the paper. Let us consider two diametrically opposite elements as shown in the figure.Since the direction of current is opposite, forces will cancel each other due to dF=i(dl×B) Similarly, all forces acting on the diametrically opposite elements will cancel out in pair. The net force on the loop will be zero.
Aditi Ghuge · 5 years ago
When a close loop having current flows in it Placed in magnetic field then no any force act on it.
Aman Ansari · 5 years ago
Becoz force is equal to BIL and there is L is equal to zero L is vector length which is the length between starting point and end point
Aman Ansari · 5 years ago
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