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There are 50 turns / cm in a long solenoid. If 4 Amp current is flowing in the solenoid, the approximate value of mag. field along its axis at an internal point and one end will be

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

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The distance at which the magnetic field on axis as compared to the mag. field at the centre of the coil carrying current I and radius R is , `1/8` would

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

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In a H-atom, an electron moves in a circular orbit of radius `5.2xx 10^(-11)` meter and produces a mag. field of 12.56 Tesla at its nucleus. The current produced by the motion of the electron will be .................

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

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A conducting rod of 1 meter length and 1 kg mass is suspended by two vertical wires through its ends. An external magnetic field of 2 Tesla is applied normal to the rod. Now the current to be passed through the rod so as to make the tension in the wires zero is [take g = 10

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

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A straight wire of mass 200 gm and length 1.5 meter carries a current of 2 Amp. It is suspended in mid-air by a uniform horizontal magnetic field B. [take g = 10 m/`s^2` ]. The B is

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

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A long solenoid has 200 turns per cm and carries a current of 2.5 Amp. The mag. field at its centre is ......................

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

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Two concentric co-planar circular Loops of radii `r_1` and `r_2` carry currents of respectively I1 and I2 in opposite directions. The magnetic induction at the centre of the Loops is half that due to I1 alone at the centre. If `r_2 = 2r_1` the value of `I_2/ I_1`

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

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Circular loop of a wire and a long straight `I_C` , `I_E` respectively as shown in fig. Assuming that these are placed in the same plane. The mag. field will be zero at the centre of the Loop when separation H is

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For the mag. field to be maximum due to a small element of current carrying conductor at a point, the angle between the element and the line joining the element to the given point must

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

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When a certain length of wire is turned into one circular Loop, the magnetic induction at the centre of coil due to some current flowing is B0 . If the same wire is turned into three Loops to make a circular coil, the magnetic induction at the centre of this coil for

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

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A long straight wire carrying current of 30 Amp is placed in an external uniform mag. field of induction `4xx 10^(-4)` tesla. The mag. field is acting parallel to the directon of current. The magnitude of the resultant magnetic induction in tesla at a point 2 cm away from the wire is .........................

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

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A long wire carries a steady current. It is bent into a circle of one turn and the magnetic field at the centre of the coil is B. It is then bent into a circular Loop of n turns. The magnetic field at the centre of the coil for same current will

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

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The mag. field due to a current carrying circular Loop of radius 3 cm at a point on the axis at a distance of 4 cm from the centre is `54mu T` what will be its value at the centre of the

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When the current flowing in a circular coil is doubled and the number of turns of the coil in it is halved, the magnetic field at its centre will

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Two wires of same length are shaped into a square and a circle. If they carry same current, ratio of the magnetic moment

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Two concentric coils each of radius equal to `2pi` cm are placed at right angles to each other. 3 Amp and 4 Amp are the currents flowing in each coil respectively. The magnetic field intensity at the centre of the coils will be ........................

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

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Two parallel long wires A and B carry currents I1 and I2 . (I2 < I1 ) when I1 and I2 are in the same direction the mag. field at a point mid way between the wires is 10 µT. If I2 is reversed, the field becomes `30 muT` . The ratio `I_1/ I_2` is

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

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Two parallel long straight conductors are placed at right angle to the meter scale at the 2 cm and 6 cm marks as shown in the figure. If they carry currents I and 3I respectively in the upward direction, then will produce zero magnetic field

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

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A long solenoid has 800 turns per meter length of solenoid. A current of 1.6 Amp flowsthrough it. The magnetic induction at the end of the solenoid on its axis is

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

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