In a certain region, the electric potential due to a charge ...

[mpobi80]

In a certain region, the electric potential due to a charge distribution is given by the equation V(x,y) = 2xy - x2 - y, where x and y are measured in meters and V is in volts. At which point is the electric field equal to zero?
 
  A) x = 0.5 m, y = 1 m
  B) x = 1 m, y = 1 m
  C) x = 1 m, y = 0.5 m
  D) x = 0.5 m, y = 0.5 m
  E) x = 0 m, y = 0 m

Question 2

A 1000-turn toroidal solenoid has a central radius of 4.2 cm and is carrying a current of 1.7 A. What is the magnitude of the magnetic field inside the solenoid at the central radius? (0 = 4  10-7 T  m/A)
 
  A) 81 mT B) zero C) 16 mT D) 8.1 mT E) 51 mT

[Li Jun]

Answer to Question 1

D

Answer to Question 2

D

[mpobi80]

TYSM

[tranoy]

Gracias!