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प्रश्न
Using Lenz’s law, predict the direction of induced current in conducting rings 1 and 2 when the current in the wire is steadily decreasing.
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उत्तर
Current in the wire is steadily decreasing, so the induced current in rings 1 and 2 will flow in such a way that it opposes the decrease of current
- ring 1 is clockwise
- ring 2 is anti-clockwise
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संबंधित प्रश्न
The direction of current in the coil at one end of an electromagnet is clockwise. This end of the electromagnet will be:
(a) north pole
(b) east pole
(c) south pole
(d) west pole
When a wire is moved up and down in a magnetic field, a current is induced in the wire. What is this phenomenon known as?
- What kind of energy change takes place when a magnet is moved towards a coil having a galvanometer at its ends?
- Name the phenomenon.
Draw a simple labeled diagram of a step-down transformer.
Answer the following:
State the principles of the electric motor and electric generator.
What is an electromagnet?
State the purpose of soft iron core used in making an electromagnet.
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
Give an illustration of determining direction of induced current by using Lenz’s law.
A sheet is placed on horizontal surface in front of a strong magnetic pole. A force is needed to:
- hold the sheet there if it is magnetic.
- hold the sheet there if it is non-magnetic.
- move the sheet away from the pole with uniform velocity if it is conducting.
- move the sheet away from the pole with uniform velocity if it is both, non-conducting and nonpolar.
Choose the correct statement(s) from the options given below:
