A scalar is a value that:
a) has neither magnitude nor direction
b)has only direction
c)has both magnitude and direction
d) has only magnitude
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Ответ:
Explanation:
A scalar is a value that has only magnitude.
Ответ:
option A is correct.
Explanation:Because in option C :magnetic field is constant.
Option D:Because in option D,electric field is constant.
Because constant electric and magnetic fields cannot produce electric current.
Option B:A changing electric field cannot produce magnetic field.
Option A:Because a changing magnetic field can produce electric current.