Advertisements
Advertisements
Question
A magnetic compass needle is placed in the plane of paper near point A as shown in Figure. In which plane should a straight current carrying conductor be placed so that it passes through A and there is no change in the deflection of the compass? Under what condition is the deflection maximum and why?
Solution
We know that when the magnetic field and the direction of the current are perpendicular to each other, the deflection is maximum. But when they are on the same plane, no deflection takes place.
If we place the current-carrying conductor in the plane of paper such that it passes through A then, the field produced by it is perpendicular to the plane of paper and parallel to the vertical axis of the compass needle. As a result, there will be no deflection of the compass needle.
The deflection in the compass needle will be maximum when the conductor passes through A and is perpendicular to the plane of the paper.
APPEARS IN
RELATED QUESTIONS
On reversing the direction of the current in a wire, the magnetic field produced by it gets ______.
Draw a diagram showing the directions of three magnetic field lines due to a straight wire carrying current. Also show the direction of current in the wire.
How is the magnetic field due to a straight current carrying wire affected if current in wire is reversed?
Describe a set up for plotting the magnetic lines of force in: (i) A straight wire, (ii) A circular coil and (iii) A straight solenoid.
Which of the following statement is not correct about the magnetic field?
With the help of a labelled circuit diagram illustrate the pattern of field lines of the magnetic field around a current carrying straight long conducting wire. How is the right hand thumb rule useful to find direction of magnetic field associated with a current carrying conductor?
These consist of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below:
Assertion: On freely suspending a current – carrying solenoid, it comes to rest in Geographical N-S direction.
Reason: One end of current carrying straight solenoid behaves as a North pole and the other end as a South pole, just like a bar magnet.
When is the force experienced by a current-carrying straight conductor placed in a uniform magnetic field.
- Maximum
- Minimum
Two LED bulbs of 12W and 6W are connected in series. If the current through 12W bulb is 0.06A the current through 6W bulb will be ______.
- Assertion: A compass needle is placed near a current-carrying wire. The deflection of the compass needle decreases when the magnitude of the current in the wire is increased.
- Reason: The strength of a magnetic field at a point near the conductor increases by increasing the current.