Science
The resultant magnetic field at point 'P' situated midway between two parallel wires (placed horizontally) each carrying a steady current I is
- in the same direction as the current in the wires.
- in the vertically upward direction.
- zero
- in the vertically downward direction.
Electro-Magnetism
43 Likes
Answer
zero
Reason — The magnetic fields produced at the midpoint P, by the currents flowing in the same direction in the two parallel wires will be equal in magnitude but opposite in direction.
Hence, the resultant magnetic field at P will be zero.
Answered By
24 Likes
Related Questions
In domestic electric circuits the wiring with 15 A current rating is for the electric devices which have
- higher power ratings such as geyser.
- lower power ratings such as fan.
- metallic bodies and low power ratings.
- non-metallic bodies and low power ratings.
Assertion (A) : The colour of aqueous solution of copper sulphate turns colourless when a piece of lead is added to it.
Reason (R) : Lead is more reactive than copper, and hence displaces copper from its salt solution.
- Both (A) and (R) are true and (R) is the correct explanation of (A).
- Both (A) and (R) are true, but (R) is not the correct explanation of (A).
- (A) is true, but (R) is false.
- (A) is false, but (R) is true.
Assertion (A) : Genes inherited from the parents decide the sex of a child.
Reason (R) : X chromosome in a male child is inherited from his father.
- Both (A) and (R) are true and (R) is the correct explanation of (A).
- Both (A) and (R) are true, but (R) is not the correct explanation of (A).
- (A) is true, but (R) is false.
- (A) is false, but (R) is true.
In the following diagram, the position of the needle is shown on the scale of a voltmeter. The least count of the voltmeter and the reading shown by it respectively are :
- 0.15 V and 1.6 V
- 0.05 V and 1.6 V
- 0.15 V and 1.8 V
- 0.05 V and 1.8 V