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प्रश्न
Choose the incorrect statement
विकल्प
Fleming’s right-hand rule is a simple rule to know the direction of induced current
The right-hand thumb rule is used to find the direction of magnetic fields due to current carrying conductors
The difference between the direct and alternating currents is that the direct current always flows in one direction, whereas the alternating current reverses its direction periodically
In India, the AC changes direction after every `1/50` second
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उत्तर
In India, the AC changes direction after every `1/50` second
Explanation -
Here option (a), (b) and (c) are knowledge-based options and are correct.
Option (d) is incorrect because the frequency of 'AC' in India is 50 cycles/s. So, the time period of AC is `1/50` s. We know that AC changes its direction after every half time period, i.e., `1/(2 xx 50)` or `1/100` s. So, in India, the AC changes direction after every `1/100` s.
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संबंधित प्रश्न
State the rule to determine the direction of a magnetic field produced around a straight conductor-carrying current.
State the rule to determine the direction of a current induced in a coil due to its rotation in a magnetic field.
State the right-hand thumb rule.
What is the other name of Maxwell's right-hand thumb rule?
State and explain Maxwell's right-hand thumb rule.
Name the rule which gives the direction of induced current.
State and explain Fleming's right hand rule.
Name and state the rule to find the direction of current induced in a coil due to its rotation in a magnetic field.
A straight wire lying in a horizontal plane carries a current from north to south.
- What will be the direction of magnetic field at a point just underneath it?
- Name the law used to arrive at the answer in part (a).
The strength of each magnet reduces to half when it is cut along its length into the equal parts magnetic field strength of a solenoid. The polarity of the solenoid can be determined by ____________.
A positive charge is moving upwards in a magnetic field directed towards the north. The particle will be deflected towards ____________.
Who has stated the Right-hand Thumb Rule?
A constant current flows in a horizontal wire in the plane of the paper from east to west as shown in Figure. The direction of magnetic field at a point will be North to South
The strength of magnetic field inside a long current carrying straight solenoid is
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Given below is a circuit to study the magnetic effect of electric current. ABCD is a cardboard kept perpendicular to the conductor XY. A magnetic compass is placed at the point P of the cardboard. P1 and P2 are the positions of the magnetic compass, before and after passing a current through XY respectively.
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- Name the rule that is used to predict the direction of deflection of the magnetic compass.
- State the direction of current in the conductor (X to Y or Y to X) when the circuit is complete.
- If resistance R is increased, then what will be the effect on the magnetic lines of force around the conductor?
