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The magnitude of the magnetic field inside a long solenoid is increased

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A long solenoid carrying a current produces a magnetic field B along its axis. If the current is doubled and the number of turns/cm is halved, the new value of the magnetic field

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The variation of magnetic field with distance d from centre of current carrying solenoid is best represented

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Toroid

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A toroid having 200 turns carries a current of 1A. The average radius of the toroid is 10 cm. The magnetic field at any point in the open space inside the toroid

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Two toroids 1 and 2 have total number of turns 200 and 100 respectively with average radii 40 cm and 20 cm, respectively. If they carry same current `i`, the ratio of the magnetic fields along the two loops

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The current in the windings on a toroid is 2.0 A. There are 400 turns and the mean circumferential length is 40 cm. If the inside magnetic field is 1.0 T, the relative permeability is near

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Time period of a charged particle undergoing a circular motion in a uniform magnetic field is independent

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Which of the following diagram is correct for the direction of magnetic force on a charge moving in a uniform magnetic

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Two particles of masses `m_a & m_b` and same charge are projected in a perpendicular magnetic field. They travel along circular paths of radius `r_a and r_b` such that `r_a > r_b`. Then, which is

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A charge particle after being accelerated through a potential difference `V` enters in a uniform magnetic field and moves in a circle of radius `r`. If `V` is doubled, the radius of the circle will

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If the velocity of charged particle has both perpendicular and parallel components while moving through a magnetic field, what is the path followed by a charged

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A beam of protons with a velocity of `4 xx 10^5 m s^(-1)` moves in the direction of uniform magnetic field. It makes an angle of 37° with the magnetic field and follows a helical path. If the time period of helix is `2 xx 10^(-7) s`, then its pitch will

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Lorentz force can be correctly expressed by the

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A proton beam passes without deviation through a region of space. This space has uniform transverse mutually perpendicular electric and magnetic fields with `E=220 kV'/'m and B = 50 mT`. The velocity of the beam

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Two parallel wires carrying currents in the same direction attract each other because

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Two long conductors, separated by a distance d carry currents `I_1 and I_2` in the same direction. They exert a force F on each other. Now, the current in one of them is increased to two times and its direction is reversed. The distance is also increased to `3d`. The new value of the force between them

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A current carrying square loop is suspended in a uniform magnetic field acting in the plane of the loop. If the force on one arm of the loop is F, then the net force on the remaining three arms of the loop

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A rectangular loop of sides `10 cm and 5 cm` carrying a current `I` of `12 A` is placed in different orientations as shown in the figures.I. II.III. IV. If there is a uniform magnetic field of `0.3 T` in the positive `z`-direction, in which orientations the loop would be in (i) stable equilibrium and (ii) unstable

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The full scale deflection current of a galvanometer of resistance `1Omega` is `5 mA`. What is the value of resistance R, which is connected in series to convert it into a voltmeter of range `5

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