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One of the two identical conducting wires of length l is bent in the form of a circular loop and the other one into a circular coil of N identical turns. if the same current is passed in both, the ratio of the magnetic field at the central of the loop B⌞ to that at the centre of the coil Bc, i.e. BLBc will be :

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Important Questions on Magnetic Effect of Current

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Alpha Question Bank for Medical: Physics>Chapter 25 - Magnetic Effect of Current>Exercise-3>Q 46
A particle having the same charge as of electron moves in a circular path of radius 0.5 cm under the influence of magnetic filed of 0.5 T. If an electric field of 100 V m-1 makes it to move in a straight path, then the mass of the particle is (Given charge of electron =1.6×10-19C )
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Alpha Question Bank for Medical: Physics>Chapter 25 - Magnetic Effect of Current>Exercise-3>Q 47
A magnet of total magnetic moment 10-2 i^ A m2 is placed in a time varying magnetic field, Bi^cosωt where B=1 Tesla and ω=0.125 rad s-1. The work done for reversing the direction of the magnetic moment at t=1 second, is:
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Alpha Question Bank for Medical: Physics>Chapter 25 - Magnetic Effect of Current>Exercise-3>Q 48
An insulating thin rod of length ℓ has a linear charge density ρx=ρ0xℓ on it. The rod is rotated about an axis passing through the origin x=0 and perpendicular to the rod. If the rod makes n rotations per second, then the time-averaged magnetic moment of the rod is
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Alpha Question Bank for Medical: Physics>Chapter 25 - Magnetic Effect of Current>Exercise-3>Q 49
A proton and an α- particle (with their masses in the ratio of 1:4 and charges in the ratio of 1:2 ) are accelerated from rest through a potential difference V. If a uniform magnetic field B is set up perpendicular to their velocities, the ratio of the radii rp:rα of the circular paths described by them will be:
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Alpha Question Bank for Medical: Physics>Chapter 25 - Magnetic Effect of Current>Exercise-3>Q 50
A bar magnet is hung by a cotton thread in a uniform horizontal magnetic field and is in the equilibrium state. The energy required to rotate it by 60° is W. Now the torque required to keep the magnet in this new position is
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Alpha Question Bank for Medical: Physics>Chapter 25 - Magnetic Effect of Current>Exercise-3>Q 51
The region between y=0 and y=-d contains a magnetic field B→=Bz^. A particle of mass m and charge q enters the region with a velocity v→=vi^. If d=mv2qB, the acceleration of the charged particle at the point of its emergence at the other side is:
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Alpha Question Bank for Medical: Physics>Chapter 25 - Magnetic Effect of Current>Exercise-3>Q 52
In an experiment, electrons are accelerated, from rest, by applying a voltage of 500 V. Calculate the radius of the path if a magnetic field 100 mT is then applied. [ Charge of the electron =1.6×10-19C , Mass of the electron =9.1×10-31kg ]
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Alpha Question Bank for Medical: Physics>Chapter 25 - Magnetic Effect of Current>Exercise-3>Q 53
The radiation corresponding to 3→2 transition of hydrogen atom falls on a metal surface to produce photoelectrons. These electrons are made to enter a magnetic field of 3×10–4 T. If the radius of the largest circular path followed by these electrons is 10.0 mm, the work function of the metal is close to :