Question

A wire loop has an area of 0.12 m2, and the magnetic field through it increases from 0 to 0.20 T in 0.30 s. What is the induced emf in the loop?


0.80 V

0.080 V

0.024 V <<<<<

0.0072 V

Answer 1

In which case is there an induced electromotive force?

An electromagnet operating on direct current is held inside a second coil of wire.

An electromagnet operating on alternating current is held inside a second coil of wire.

A permanent bar magnet is held inside a coil of wire. <<<<<<<

Field lines from earth's magnetic field cross the area of a coil of wire.

Answer 2

Which of these is an example of electromagnetic induction?

A moving charge produces a magnetic and electric field.

A current through a wire produces a magnetic field.

A changing magnetic field induces an electromotive force. <<<<<

A current passing through a resistor uses power IR2.

Answer 3

@ParthKohli can u look over my answers?

Answer 4

Last one is correct, but you must have a look at first and second one again.

Answer 5

@Vincent-Lyon.Fr ...On wikipedia, it says: When a permanent magnet is moved relative to a conductor, or vice versa, an electromotive force is created"...I just dont see anything about it in my text...so Idk.

Also for the first one I keep calculating it to get 0.03? and that 0.024 was the closest. Could you show me how to solve these?

Answer 6

How do you get 0.03? And what laws are you using to get that result?

Answer 7

\[emf = -(flux / time)\]

Answer 8

This is correct. So you should not find 0.03 V.