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प्रश्न
Welders wear special glass goggles while working. Why? Explain.
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उत्तर
Welders wear special glass goggles while working so that they can protect their eyes from harmful electromagnetic radiation.
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संबंधित प्रश्न
State three differences between direct current and alternating current.
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?
Name and state the law which determines the direction of induced current.
or
State Fleming’s right-hand rule.
Show diagrammatically how an alternating emf is generated by a loop of wire rotating in a magnetic field. Write the expression for the instantaneous value of the emf induced in the rotating loop.
Fill in the blanks by writing (i) Only soft iron, (ii) Only steel, (iii) Both soft-iron and steel for the material of core and/or magnet.
Transformer______.
List some of the practical applications of an electromagnet.
Write the two names in the following diagram.
Right hand thumb rule.
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
Show that Lenz’s law is in accordance with the law of conservation of energy.
Ansari Sir was demonstrating an experiment in his class with the setup as shown in the figure below.
A magnet is attached to a spring. The magnet can go in and out of the stationary coil. He lifted the Magnet and released it to make it oscillate through the coil.
Based on your understanding of the phenomenon, answer the following question.
Consider the situation where the Magnet goes in and out of the coil. State two changes which could be made to increase the deflection in the galvanometer.
