Recent questions tagged #mcq

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Let the magnetic field on earth be modelled by that of a point magnetic dipole at the centre of earth. The angle of dip at a point on the geographical

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Two charged particles traverse identical helical paths in a completely opposite sense in a uniform magnetic field B = `B_0

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Biot-Savart law indicates that the moving electrons (velocity v) produce a magnetic field B such

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A current carrying circular loop of radius R is placed in the x-y plane with centre at the origin. Half of the loop with x > 0 is now bent so that it now lies in the y-z

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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An electron is projected with uniform velocity along the axis of a current carrying long solenoid. Which of the following is

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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In a cyclotron, a charged

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A circular current loop of magnetic moment M is in an arbitrary orientation in an external magnetic field B. The work done to rotate the loop by 30° about an axis perpendicular to its plane

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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The gyro-magnetic ratio of an electron in an H-atom, according to Bohr model,

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Consider a wire carrying a steady current, I placed in a uniform magnetic field B perpendicular to its length. Consider the charges inside the wire. It is known that magnetic forces do no work. This implies

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Two identical current carrying coaxial loops, carry current I in an opposite sense. A simple amperian loop passes through both of them once. Calling the loop as

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A cubical region of space is filled with some uniform electric and magnetic fields. An electron enters the cube across one of its faces with velocity v and a positron enters via opposite face with velocity- v. At this

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A charged particle would continue to move with a constant velocityin a region

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An element `vec(dl)= dxuarr` (where dx = 1 cm) is placed at the origin and carries a large current I = 10 Amp. What is the mag. field on the Y-axis at a distance of 0.5 meter

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Two straight long conductors AOB and COD are perpendicular to each other and carry currents I1 and I2 . The magnitude of the mag. field at a point 'P' at a distance 'a' from the point 'O' in a direction perpendicular to the plane ABCD

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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`BrarrR` graph. The mag. field B at a distance r from a long straight wire carrying a current varies with r as shown in

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A current path shaped as shown in figure produces a mag. field at point 'P', the centre of the arc BC. If the arc subtends an angle of `30^0` and the radius of the arc is 0.6 meter. What is the magnitude of the field at point P if the current is 3 AMP

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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As shown in figure a conductor carrying a current I. Find the magnetic field intensity at the point

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A length L of wire carries a steady current 1. It is bent first to form a coil of 1 turn. The same length is now bent more sharply to give a double loop of smaller radius. The magnetic field at the centre caused by the same current

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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If a long hollow copper pipe carries a direct current, the magnetic field associated with the current will be

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The magnetic induction at a point P which is at a distance 4 cm from a long current carrying wire is `10^(-8 )` tesla. The field of induction at a distance 12 cm from the same current would be

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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