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A long straight wire of radius 'a' carries a steady current I the current is uniformly distributed across its cross-section. The ratio of the magnetic field at a/2 and 2a is

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

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At a distance of 10 cm from a long straight wire carrying current, the magnetic field is `4xx10^(-2)` . At the distance of 40 cm, the magnetic field will be

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As shown in figure ABCD and CDEF planes are kept carrying current I. Each side of the plane is having length '2a'. The magnetic field due to ABCD and CDEF planes at the point P(a, 0, a) is in the

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

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A He nucleus makes a full rotation in a circle of radius 0.8 meter in 2 sec. The value of the mag. field B at the centre of the circle will be ...................

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

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The magnetic field at pt. 'O' in the figure shown is ..................... Where AB = CD = 2 cm R1 = 10 cm R2 = 12 cm I = 4

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

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As shown in Fig. there are two semicircles of radii `r_1 = 12 cm` and `r_2 = 10 cm` in which 4 Amp current is flowing The mag. field at the centre 'O' is

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The direction of mag. field lines close to a straight conductor carrying current will be

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Due to 10 Amp of current flowing in a circular coil of 10 cm radius, the mag. field produced at its centre is `pixx10^(-3)` Tesla. The number of turns in the coil will

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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

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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

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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

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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

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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 ......................

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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

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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

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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 .........................

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

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

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