An electric current passes through a straight wire. Magnetic compasses are placed at the points X and Y.
A Their needles will not deflect.
B Only one of the needles will deflect.
C The needles will deflect in the same direction.
D The needles will deflect in the opposite directions.
Ans 1: (Master Answer)
The correct answer is D
Current carrying wire produces magnetic field, but direction of magnetic field on the given points X and Y are different.
This is found by right hand thumb rule. So magnetic compasses on X and Yexperience magnetic force of same magnitude but in opposite directions. Hence, the needles will deflect in opposite directions.
Three closed similar coils P, Q and R are placed such that their planes are parallel. In the coil P and R, current of same magnitude flows as shown in the figure. Coils Q and R are static while coil P is moved with a uniform speed towards Q, then
A Clockwise current will be induced in coil Q, as seen by eye
B Anti-clockwise current will be induced in coil Q, as seen by eye.
C No current will flow in coil Q
D Current induced in coil Q will be equal to P and R, but in opposite direction, hence net current in Q will be zero.
Ans 1: (Master Answer)
The correct answer is B
Coil P is moved with a uniform speed towards Q while R is static. Due to the current in P, magnetic field is from right to left. When P is moved towards Q, magnetic lines passing through Q (from right to left) will increase, i.e., magnetic flux passing through Q will increase. Therefore, current will be induced in Q. The induced current will have such a direction that it gives a magnetic field opposite to that passing through Q due to current in P. Thus, anticlockwise current will be induced in coil Q, opposite to the direction of current in coil P.
Study the given food web and answer the
(A) How many animals are carnivores?
(B) How many animals are omnivores?
Why D option is correct not option A
Identify the wrong term in the given series.
ZA, DE, HI, OP, PQ
What do you think is the answere= to this
Select the pair which shows similar relationship that is shown by the following pair.
ABC : CDE
A LNM : NOO
B PDF : RFH
C PQR : QRS
D XYZ : ZAX
Can you please give the answer to this? I think it is 'D' but SOF says that it is 'B' can you plz tell me how?