Questions in Moving Charges and Magnetism

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A 100 turns coil shown in figure carries a current of 2 amp in a magnetic field $B = 0.2\,Wb/{m^2}$. The torque acting on the coil is Question Image
A current of 5 ampere is flowing in a wire of length 1.5 metres. A force of 7.5 N acts on it when it is placed in a uniform magnetic field of 2 Tesla. The angle between the magnetic field and the direction of the current is
A conductor in the form of a right angleABC with AB = 3 cm and BC = 4 cm carries a current of 10 A. There is a uniform magnetic field of 5 T perpendicular to the plane of the conductor. The force on the conductor will be
The coil of a galvanometer consists of 100 turns and effective area of 1 square cm. The restoring couple is ${10^{ - 8}}\,N - m/radian$. The magnetic field between the pole pieces is 5 T. The current sensitivity of this galvanometer will be
A rectangular coil $20\,cm \times 20\,cm$ has 100 turns and carries a current of 1 A. It is placed in a uniform magnetic field B =0.5 T with the direction of magnetic field parallel to the plane of the coil. The magnitude of the torque required to hold this coil in this position is
If a current is passed in a spring, it
A current carrying small loop behaves like a small magnet. If A be its area and M its magnetic moment, the current in the loop will be
In hydrogen atom, the electron is making $6.6 \times {10^{15}}\,rev/\sec $ around the nucleus in an orbit of radius 0.528 Å. The magnetic moment $(A - {m^2})$ will be
A triangular loop of side l carries a current I. It is placed in a magnetic field B such that the plane of the loop is in the direction of B. The torque on the loop is
Three long, straight and parallel wires carrying currents are arranged as shown in the figure. The wire C which carries a current of 5.0 amp is so placed that it experiences no force. The distance of wire C from wire D is then Question Image

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