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Magnetic Field Lines Form Closed Loop

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How magnetic field on the axis of a loop is zero

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a but wires are not touching the loop, it is found that the net magnetic field on the axis of the loop is zero at a height

h

above the loop. In that case :

Q. Assertion :The net force on a closed circular current carrying loop placed in a uniform magnetic field is zero. Reason: The torque produced in a conducting circular ring is zero when it is placed in a uniform magnetic field such that the magnetic field is perpendicular to the plane of loop.

Q. If the net force acting on a closed loop is zero then how can a torque act on it??? Moving coil galvanometer has a closed rectangular loop ...still it rotates in uniform magnetic field

Q. Derive the expression for magnetic field at a point on the axis of a circular current carrying loop.

Q. The length of side of a square loop is 4m. This loop is placed in a uniform magnetic field of 2.5 t. Outside the loop, the magnetic field is zero and it is coming out side from magnetic field perpendicularly with velocity 2m/s. Find the value of induced emf in loop after one second.

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Magnetic Field Lines Form Closed Loop

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