Some pins are placed near the end of a nail shown in the circuit diagram. Now the current is switched on for some time and then switched off. What will happen?

As the current is switched on the pins cling to the tip of the nail but when it is switched off, the pins drop back

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As the current is switched on the pins cling to the tip of the nail and remain clinged even after the current is switched off

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The pins get repelled by the tip of the nail

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The pins do not cling to the tip of the nail

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Solution

The correct option is A
As the current is switched on the pins cling to the tip of the nail but when it is switched off, the pins drop back

When current is passed through the wire wound on the nail, the nail behaves as electromagnet and attracts the pins. As soon as current supply is cut off, the nail no longer behaves as an electromagnet and the pins are no longer attracted by it.

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Question 17

Your teacher has shown you the following activity

Activity: Teacher has wound a long insulated piece of wire around an iron nail in the form of a coil. Free ends of the wire are connected to a cell through a switch as shown in the Figure 14.3. The current is switched on and some pins are placed near the ends of the nail.

Write down any three questions that come to your mind about this activity

Q. Some statements are given, followed by some conclusions. Consider the statements to be true even if they seem to be at variance from commonly known facts. Decide which of the given conclusions follow from the given statements.

Statements: Some pins are needles. Some threads needles. All needles are nails. All nails are hammers.
Conclusions:
I. Some pins are hammers.
II. Some threads are nails.
III. Some pins are threads.
IV. No pin is thread.

Q. Choose the correct option about conclusion drawn from the statements given below.

Statements:
Some pins are needles.
Some threads are needles.
All needles are nails.
All nails are hammers.

Conclusions:
(I) Some pins are hammers.
(II) Some threads are nails.
(III) Some pins are threads.
(IV) No pin is thread.

Q. Consider the given circuit in which three bulbs A, B and C are connected in series. Which bulbs will glow when the tip of the safety-pin (acting as the switch) touches the end Y?

When current is 'switched on ' and switched off' in a coil, a current is induced in another coil kept near it . What is this phenomenon known as ?

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