Advertisements
Advertisements
Question
State and explain the clock-face rule for determining the polarities of a circular wire carrying current.
Advertisements
Solution
This rule is used to determine the polarity of two faces of a current-carrying circular coil.
According to the clock-face rule, if we look at one face of the coil through which a current is passing, we have the following conclusions:
- If the current around the face of the coil flows in a clockwise direction, that face of the coil will be the south pole.
- If the current around the face of the coil flows in an anticlockwise direction, that face of the coil will be north pole.
RELATED QUESTIONS
A positively-charged particle (alpha-particle) projected towards west is deflected towards north by a magnetic field. The direction of magnetic field is ______.
What concealed do you get from the observation that a current-carrying wire deflects a compass needle placed near it?
The diagram given below represents magnetic field caused by a current-carrying conductor which is:
(a) a long straight wire
(b) a circular coil
(c) a solenoid
(d) a short straight wire
A current-carrying straight wire is held in exactly vertical position. If the current passes through this wire in the vertically upward direction, what is the direction of magnetic field produced by it? Name the rule used to find the direction of magnetic field.
A horizontal wire carries a current as shown in Figure below between magnetic poles N and S:
Is the direction of the force on the wire due to the magnet:
(a) in the direction the current
(b) vertically downwards
(c) opposite to the current direction
(d) vertically upwards
i) Which principle is explained in this figure?
ii) Which rule is used to find out the direction of a force in this principle?
iii) In which machine this principle is used? Draw a diagram showing working of that machine
A flat coil ABCD is freely suspended between the pole pieces of a U-shaped permanent magnet with the plane of coil parallel to the magnetic field.
When will the couple acting on the coil be
- maximum
- minimum?
Observe the given figure of Fleming's Left Hand Rule and write the labels of 'A' and 'B':
An alpha particle enters a uniform magnetic field as shown. The direction of force experienced by the alpha particle is ______.
Two LED bulbs of 10W and 5W are connected in series. If the current flowing through 5W bulb is 0.005A, the current flowing through 10W bulb is ______.
