1) the voltage induced across an inductor by changing magnetic field tends to: a

Question

1) the voltage induced across an inductor by changing magnetic field tends to:
a) oppose the current in the inductor
b)oppose a change in the current
c)oppose the voltage across the inductor.
d)oppose a change in the voltage

2) assume a neon bulbs in parallel with the large inductor when the current is interrupted by opening a switch the neon ball clothes for short time this is due t.o
a) the rapid change in resistance
b) the time constant of the circuit
c)collapsing magnetic field
d)induced voltage across the inductor

3) the total inductance of a parallel inductor is always?
a) less than the smallest inductor
b) less the largest inductor
c)greater than the smallest inductor
d)great than the largest inductor

4) assume two inductors have the same physical size and core material but conductor A has twice the number of windings of conductor B what can we conclude from that:
a)inductance of A is one fourth that of B
b) inductance is equal
c)inductance in A is twice that of B
d)inductance of A is four times that of B

Explanation / Answer

1) V = -Ldi/dt i.e voltage is opposing the change in current

2) is it clothes ? or something else

3)a) less than the smallest inductor : ( since inductance in parallel is analogous to resistance in parallel)

4) L is directly proportional to square of number of turns. Hence answer iis d) inductance of A is four times that of B

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