The use of fuses in electric power-lines is :
When the main switch of the house circuit is put off, it disconnects the :
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When a fuse is rated at 8 A, it means :
According to International Convention of colour coding of wires used in household electrical circuits :
The magnetic field lines inside a current carrying solenoid are :
Potential difference between a live wire and the neutral wire is :
Which of the following statements is incorrect regarding magnetic field lines :
The magnetic field near a long straight wire is described by :
The phenomenon of electromagnetic induction is :
Potential difference between a live wire and the neutral wire is :
A rectangular coil of copper wires is rotated in a magnetic field. The direction of the induced current changes once in each :
Magnetic field inside a long solenoid carrying current is :
At the time of short circuit, the current in the circuit :
The frequency of direct current is :
The frequency of household supply of a.c. in India is :
The most important safety device method used for protecting electrical appliances from short circuiting or overloading is :
Current flowing in conductor A is 2A and current flowing in conductor B is 4A. The ratio of magnetic field produced around conductor A to the magnetic field produced around conductor B at a distance 10 cm from both the conductors is:
Current flowing in conductors A and B is same, what is the ratio of the magnetic field produced around the conductor A at a distance of 5 cm from the conductor to the magnetic field produced around the conductor B at a distance of 2 cm from this conductor is
Same amount of current flows in the same direction .long the two parallel conductors separated by a small distance:
When an electric current flows through a long solenoid, magnetic field is set up in and around the solenoid :
Magnetic field produced at the centre of a current carrying circular wire is :
In all the electrical appliances, the switches are put in the
Which of the following properties of a proton can change while it moves freely in a magnetic field ?
A positively charged particle say an alpha particle projected towards west is deflected towards north by a magnetic field. The direction of the magnetic field is :
3 videos|687 docs|659 tests
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3 videos|687 docs|659 tests
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