# Consider a solenoid of length L, N windings, and radius b (L is much longer than b). A current I is flowing through the wire. If the radius of the solenoid were doubled (becoming 2b), and all other quantities remained the same, the magnetic field is same, half, twice as strong?  Need to understand the concept.

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Consider a solenoid of length L, N windings, and radius b (L is much longer than b). A current I is flowing through the wire. If the radius of the solenoid were doubled (becoming 2b), and all other quantities remained the same, the magnetic field is same, half, twice as strong?  Need to understand the concept.

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Step 1

Let the length of the solenoid be L, number of windings be N, and radius be b.

Step 2

Write the expression for the magneti... help_outlineImage Transcriptionclose[N is the number of turns I is the curent Lis the length of the solenoid B 4NI L fullscreen

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### Magnetic Effects of Current 