What the field inside a solenoid or toroid depends on

1. A.
   total number of turns of the wire.
2. B.
   length of the solenoid.
3. C.
   radius of the wire.
4. D.
   current carried by the wire.

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1. A.
   number of turns per unit length
2. B.
   current passing through it
3. C.
   radius of the toroidal solenoid
4. D.
   permeability

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1. A.
   (a), (b) and (d)
2. B.
   (a), (b) and (c)
3. C.
   (b), (c) and (d)
4. D.
   (a), (c) and (d)

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1. A.
   decreasing its radius
2. B.
   decreasing the current through it
3. C.
   increasing its area of cross-section
4. D.
   introducing a medium of higher permeability

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1. A.
   decreasing its radius
2. B.
   decreasing the current through it
3. C.
   increasing the area of cross-section
4. D.
   introducing a medium of higher permeability

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