Question

Which of the following is NOT correct?

a A changing electric field can produce a changing magnetic field

b A steady magnetic field produces a steady current

c A changing magnetic field can produce a changing current

d A changing magnetic field can produce a changing current

Answer 1

here is option d A changing magnetic field can produce a steady electric field

Answer 2

b) a changing magnetic field produces a current not a constant one. Faraday's law

The change in flux over the change in time gives the current

Answer 3

have u looked at option d @azolotor

Answer 4

D is a correct statement

Answer 5

A changing magnetic field can produce a steady electric field?

Answer 6

not a steady one. An alternating one. That is what D is saying

Answer 7

dats actually an error this is the d option is A changing magnetic field can produce a steady electric field?

Answer 8

I would still go wtih B

Answer 9

B Is correct since a wire which is a part of a closed circuit passesing through a fixed field will develop current if the net FLUX through the loop changes ( the field is constant). .Lenz's Law. Principle of operation of generators.

Answer 10

B is a good choice.

Answer 11

b A steady magnetic field produces a steady current

This one is definitely a false statement, so it's your answer to the original question ("which statement is NOT correct?"). An unchanging/static magnetic field (relative to a wire/circuit) induces zero current. @gleem that's what option b is saying, the net flux is not changing, ie the circuit is not moving through the field.

Option d is a true statement. A changing magnetic field can produce a steady electric field - if the field is changing at a constant rate, it should induce a constant current, which should in turn create a steady electric field.

Answer 12

You need a circuit in c to be correct; a changing magnetic field produces no current unless you have a circuit in the field.. so I stick with my response a fixed field can produce an electric current just what the question asked if you have a moving( rotating) circuit in the field.

Answer 13

@gleem the question is "Which of the following is NOT correct? " read the question and options carefully,

b A steady magnetic field produces a steady current

c A changing magnetic field CAN produce a changing current

see that keyword "can" in option C? Of course you need a circuit to induce a current, you'd need a circuit in B as well (and that circuit has to be *moving* relative to the field).

Your response, B: a static magnetic field (relative to a circuit/loop) CAN NOT induce a current - B is the false statement, the others are all true.