How many receptacles can be on a branch circuit for a refrigerator? 

I need help with this pls

First Part

In the toroidal coil of the figure below the outer radius is equal to 5cm and the
internal with 4cm. The core is made of ferromagnetic material, the
coil has 400 + 13 coils and is leaked by a current of 0.3 A. The relative magnetic
permeability of ferromagnetic material is 2000.
1. Calculate the magnetic flux Φ in the core.
2. Calculate magnetic induction B.

Second Part

The toroidal coil itself is made of ferromagnetic material M1929, and the coil
it has 400 + 13 spirals.
1. How much current will need to pass through the coil in order to grow
magnetic flux equal to 0.12 mWb.
2. How much current will need to pass through the coil in order to grow
magnetic flux equal to 0.06 mWb.

A dipole antenna dimensions has been designed to operate in 65MHz.

Will the same antenna work properly if frequencies a) 130MHz b) 195MHz are used?

Your answer should include the current distribution and impedance variation along the length of the antenna and how those are affected when frequencies of 130MHz and 195MHz are introduced. Also, include sketches of radiation patterns with respect to the changes in frequencies used.

Make sure you give descriptive answer in order to achieve full marks. Use diagrams to help you with the answer.