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A particle of charge -6.25 nC experiences a force of 1.25 N when it is moving at 3.75 x 10-4 m/s. Its motion is perpendicular to the magnetic field produced by a current-carrying wire, which is 3.0 cm from it. (a) What is the magnitude of the magnetic field? (b) How much current flows through the wire?
An electron experiences the greatest force as it travels 2.9 × 106 m s-1
in a magnetic
field when it is moving northward. The force is upward and of 7.2 × 10-13 N
magnitude. What are the magnitude and direction of the magnetic field? How to
reduce deflection force on the electron?
A 20 m constantan wire with 4 mm thickness connected to a 6 V battery. Given
resistivity of constantan is 49 10-8 m. Calculate
a. Current in the circuit
b. Power dissipated by the wire
A parallel plate air capacitor has a capacitance of 5.0 F. (a) What is its capacitance if the separation between the plates is decreased to one-half its original value while keeping all other factors constant? (b) What is its capacitance if the area of the plates is decreased to one-half its origi alue while keeping all other factors constant? (c) What is the capacitance if a dielectric of relative permeability of 2 is inserted between the plates of the original air capacitor?
A proton is released from rest in a uniform horizontal electric field. It travels 3.25 m for 5 μs. Find the acceleration of the proton and the magnitude of the electric field.
What is the total electric flux through a closed surface containing a 2.0 μC charge?
Spheres A, B, and C have charges +8.0 C, +12.0 C, and -5.0 C, respectively. Spheres A and B touched each other and then separated. Sphere A then touched sphere C and then separated. (a) What is the total charge on the three spheres before and after touching each other? (b) What is the final charge on each sphere assuming they are identical? (c) What is the final charge on each sphere assuming that rA=rB=2rC?
A wire of length 0.050 𝑚 and carries a current 𝐼 is in a horizontal uniform magnetic field B of
2.50 𝑇 which is perpendicular to the rod. The weight of the wire is 0.80 𝑁. What is the value
of the current 𝐼 if the magnetic force on the wire equals its weight?
A flat circular coil which has 𝑁 turns each of diameter d carries a current 𝐼. If 𝜇0 is the
permeability of free space, what is the expression of magnetic field 𝐵 at the center of the
coil?
A current-carrying circular plate with A= 32.2 m2 is inclined at 34° with the Earth’s field direction. If the magnitude of the magnetic field is 48 125 nT, solve for the (a) angle between the normal to the surface and the B vector, and the (b) magnetic flux through the antenna
