Advertisements
Advertisements
प्रश्न
When an electric current flows through a copper wire AB as shown in Figure14.1, the wire
विकल्प
deflects a magnetic needle placed near it.
becomes red hot.
gives electric shock.
behaves like a fuse
उत्तर
deflects a magnetic needle placed near it.
Explanation:
A current-carrying wire acts as a magnet with a magnetic field around it, the strength of which depends upon the amount of current passing through it.
APPEARS IN
संबंधित प्रश्न
Draw the labelled diagram of an electric circuit comprising of a cell, a resistance, an ammeter, a voltmeter and a closed switch (or closed plug key). Which of the two has a large resistance : an ammeter or a voltmeter?
Answer the following question.
With the help of a suitable circuit diagram prove that the reciprocal of the equivalent resistance of a group of resistances joined in parallel is equal to the sum of the reciprocals of the individual resistances.
What do you understand by the open electric circuit?
Explain the following:
Open circuit
In the given circuit diagram, which of the given switch(s) should be closed. So that only bulb A glows.
Assertion: People struck by lightning receive a severe electrical shock.
Reason: Lightning carries very high voltage.
Assertion: In an open circuit, the current passes from one terminal of the electric cell to another.
Reason: Generally, the metal disc of a cell acts as a positive terminal.
Choose the statement which is not correct in the case of an electric fuse.
The ______ is a species of fish that can give electric shocks of up to six hundred fifty watts of electricity.
Name the device which is used to measure the strength of the electric current in an electric circuit.
