Advertisements
Advertisements
Question
You have been provided with a solenoid AB.
(i) What is the polarity at end A?
(ii) Give one advantage of an electromagnet over a permanent magnet.
Advertisements
Solution
(i) North pole.
(ii) The electromagnet is a very strong magnet as compared to a permanent magnet.
RELATED QUESTIONS
State three differences between direct current and alternating current.
How does an electromagnet differ forma permanent magnet?
Write some of the important uses of electromagnets.
The north-south polarities of an electromagnet can be found easily by using:
(a) Fleming's right-hand rule
(b) Fleming's left-hand rule
(c) Clock face rule
(d) Left-hand thumb rule
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?
Write Fleming’s right hand thumb rule with the help of diagram.
A thin semi-circular conducting ring (PQR) of radius r is falling with its plane vertical in a horizontal magnetic field B, as shown in the figure.
The potential difference developed across the ring when its speed v , is
There is a uniform magnetic field directed perpendicular and into the plane of the paper. An irregular shaped conducting loop is slowly changing into a circular loop in the plane of the paper. Then ______.
Which of the following phenomena makes use of electromagnetic induction?
