Electricity and Magnetism Answers

State and explain the phenomenon of electromagnetic induction and also explain various methods of changing the magnetic flux through a loop state and explain faraday's law of electromagnetic induction.

What do you mean by induced e.m.f and induced current?

state and explain the phenomenon of electromagnetic induction and also explain various method of changing the magnetic flux through a loop

A Type II superconductor is characterized by value of London penetration depth to coherence length being :­

1) 0

2) 1

3) less than 1

4) more than 1

1) If a vector field A(x,y,z)=xz³e_x - 2x²yze_y+2yz⁴e_z , calculate the curl ∇ x A at point M(1,-1,-1).

1) If a vector field A(x,y,z)=xz³e_x - 2x²yze_y+2yz⁴e_z , calculate the divergence ∇·A at point M(1,-1,-1).

1) If a scalar field φ(x,y,z)=3x²y-y³z², calculate the gradient ∇φ at point M(1,-2,1).

Maxwell’s equations in integral form are composed of four equations

as follows:

1) Gauss’s law for electrical fields                                ;

2) Faraday’s law of electromagnetic induction                        ;

3) Gauss’s law for magnetic fields                                 ;

4) Ampere’s circuital law                                ;

Assume that frog muscle cell membrane is permeable to Na and K only. The membrane permeabilities

for Na and K are 𝑃𝐾 and 𝑃𝑁𝑎, respectively. At 180C the resting membrane potential is Δ𝑉 = -85 mV. What

is ratio of permeability 𝑃 / 𝑃 ? Suppose that 𝐶𝐾 = 124 mmole/liter, 𝐶𝐾 = 2.2 mmole/liter and 𝐾𝑁𝑎 𝑖𝑛 𝑜𝑢𝑡

𝐶𝑁𝑎 = 4 mmole/liter, 𝐶𝑁𝑎 = 109 mmole/liter.

Common collector amplifier has an input resistance of Rin=10kΩ and load 

resistance of RL=100Ω. Power gain for this amplifier is 100. What is the voltage gain 

of the amplifier?