You have a coaxial cable with a voltage of 1V on the inner c

You have a coaxial cable with a voltage of 1V on the inner conductor of radius 1 cm. and a voltage of 3V on the outer conductor, with radius 2 cm. To find the electric field at points in between the two conductors you could: Measure the surface charge on the inner cylinder and then use symmetry and Gauss\'s law to determine the local electric field. Assume the voltage inside the 2cm radius cylinder is the same as at the surface (3V) because it is surrounded by a metal shield. Either a or d will work Apply Laplace\'s equation, solve it to get the voltage, then calculate the E field from the negative gradient of V

Solution

Option (D ) is correct