Electricity and Magnetism Answers

Find the Total force of q3 were the charges of difference location is q1=3nC, q2 =4nC,and q3=5nC at corner of an equalateral triangle with the side of 10 cm find the a total force on q3 and Total electric field

1. A straight wire carrying a 3.00-A current is placed in a uniform magnetic field of magnitude 0.280 T directed perpendicular to the wire. Find the magnitude of the magnetic force on a section of a wire having a length of 14.0 cm.
2. The magnetic field through a coil changes from 3 mT to 4.5 mT in 7 seconds. If the coil has 600 turns and a radius of 4 cm, what emf is induced in the coil?
3. A wire 12cm long and carrying a current of 30 A is placed in between the pole face of a magnet whose magnetic flux density is 0.9 T. If the wire is inclined at an angle of 60^o from the plane of the magnetic field, what is the force exerted on the wire?
4. A plane circular loop of conducting wire of radius 10 cm which possesses 15 turns is placed in a uniform magnetic field. The direction of the magnetic field makes an angle of 30 degrees with respect to the normal direction to the loop. The magnetic field-strength is increased at a constant rate from 1 T to 5T in a time interval of 10 s. What is the emf generated around the loop?

What is the capacitance and self-inductance per length of a cable that consists of a solid inner conductor (radius R₁) and a thin coaxial conducting cylindrical shell (inner radius R₂). The region between the conductors is filled with a uniformly distributed dielectric (dielectric constant Kappa). Mu=Mu₀

The square surface measures 3.2mm on each side. It is immersed in a uniform electric field with E=1800 N/C. the field lines make an angle of 65 with the outward ponting normal. calculate the flux through the surface

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?

Write Maxwell equation for harmonically varying field.

Assume that the wave is propagating from free space and striking to a dielectric medium normally. Give the derivation for reflection and transmission coefficient.

Calculate the value of α, β, γ ,η for a rubber at a frequency f=106 Hz. It is given that εr = 3.5, σ=10-16 mhos/m & µr=1.   

Derive the expression for impedance which varies along the transmission line. A 30-m-long lossless transmission line with Zo = 50  operating at 2 MHz is terminated with a load ZL =70+j30. Find the reflection coefficient and standing wave ratio.