The strength of the electromagnet depends on how many coils you wrap round and how high the voltage is. ... N Increasing the number of coils, which adds more field lines and makes the electromagnet stronger. This is the magnetic field around a piece of wire, compared to a magnetic field on a loop or solenoid it is weak.
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<span>D. sill
A sill forms when hot magma squeezes between layers of rock to form a hardened sheet of rock. A sill is basically a tabular sheet intrusion between old layers of sedimentary rock, volcanic beds, or in the direction of foliation inherent in metamorphic rock. The word sill means a concordant intrusive sheet.</span>
The answer is a no problem
Answer:
The near point is 
Explanation:
From the question we are told that
The power is 
The distance from the eye is 
The distance of the book from the eye is 
Generally the focal length of the glasses is
=> 
=> 
=> 
The object distance is evaluated as
=> 
=> 
The image distance is evaluated from lens formula as
=> 
=> 
=> 
The near point is evaluated as
=> 
=>
