Moving Charges and Magnetism

Related Questions

• Two straight horizontal parallel wires are carrying the same current in the same direction, $d$ is the distance between the wires. You are provided with a small freely suspended magnetic needle. At which of the following positions will the orientation of the needle be independent of the magnitude of the current in the wires

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• Four wires each of length 2.0 metres are bent into four loops P, Q, R and S and then suspended into uniform magnetic field. Same current is passed in each loop. Which statement is correct

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• Two concentric coils each of radius equal to $2\pi {\rm{ }}cm$ are placed at right angles to each other. 3 ampere and 4 ampere are the currents flowing in each coil respectively. The magnetic induction in $Weber/{m^2}$ at the centre of the coils will be $({\mu _0} = 4\pi \times {10^{ - 7}}Wb/A.m)$

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• 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

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• An electron is accelerated by a potential difference of 12000 volts. It then enters a uniform magnetic field of ${10^{ - 3}}\,T$ applied perpendicular to the path of electron. Find the radius of path. Given mass of electron $ = 9 \times {10^{ - 31}}\,kg$ and charge on electron $ = 1.6 \times {10^{ - 19}}\,C$

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