Electricity and Magnetism Answers

A square loop wire of length l= 0.1m on each side had mass 50 g and pivots about axis AA' that corresponds to a horizontal side of the square. A magnetic field of 500 G directed vertically downward, uniformly fills the region in the vicinity of the loop. The loop carries current I so that it is in equilibrium at angle 20 degree. Consider force on each side separately and find the direction of current to maintain 20 degree? Find the torque in the loop about the axis?

A 72 nC charge is located at x = 3.00 m on the x-axis and an 8.0 nC charge is located at x = 7.0 m. At what point on the x-axis is the electric field zero?

If a house is supplied with 120 V, 100 A service, 2400 W electric range 1000 W steam iron Ten 25W bulbs one 500W Refrigrator If all the appliances are used for 4 Hour 15 Minutes how much energy is converted in kWh? 

If a house is supplied with 120 V, 100 A service, find the maximum power capability. 

1. Two point particles separated by 6 cm have charges q₁ = 14nC and q₂ = -23nC, respectively. What is the magnitude of the force that each exerts on each other?

2.Two charges q₁ and q₂ are separated by a distance 0.02mm in the air. The force between them is 100N. What will be the force between the q1 and q2 place 0.06mm apart in the air.

http://i.prntscr.com/nd4-uD-ETfibTV-7MtH8mg.png

http://i.prntscr.com/X6xxznbNRoKStYUhX5SXIQ.png

https://lh5.googleusercontent.com/Sh5cNe3GkcFZjM-vC_mi8xpwniPAB_Q3yeeY4aIMIMMZ1jEmyp8wjdCSb6MeC1bMXEztEAEpsoi6Su7SZo01p-YJWXRZ59KXl1_Ic8xmaRMIqWCzRSeEHt_JIs6ClhI7Kw=w740

Given a straight wire with a 1A current flowing on it. Calculate the magnetic field magnitude at a distance of 3mm from the

wire.

If a metal sphere A having positively charged is brought into contact with an uncharged 

metal sphere. As a result:

(a) both spheres are positively charged (b) A is positively charged and B is neutral

(c) A is positively charged and B is negatively charged (d) A is neutral and B is 

positively charged