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A teacher asks students to suggest a method to demagnetise a magnet. Some responses are: A) "dropping a magnet on floor several times" B) "breaking the magnet into 2 halves" C) "heating the magnet" D) "throwing the magnet in water" E) "by hammering it" Which of the following are correct?
A bar magnet with poles 25 cm apart has a pole strength of 14.4 A-m. What is the magnetic dipole moment of the bar magnet?
When a hole is cut at the center of the bar magnet, then the pole strength of the bar magnet will:
With reference to the properties of magnetism, consider the following statements: 1. A natural magnet is an oxide of iron. 2. When a magnet is freely suspended, its one pole is always directed towards the north. 3. The middle part of the magnet has maximum magnetic power. 4. Similar poles repel each other and dissimilar poles attract each other. Which of the statements given above is/are correct?
When is a ceramic magnet used as a permanent magnet in a permanent magnet DC motor?
A bar magnet is allowed to fall vertically through a copper coil placed in a horizontal plane. The magnet falls with a net acceleration
In a family, Galaxy is the father of 5 Star. 5 Star is the mother of Milky Bar who is the unmarried brother of Bar One. Bar One is the daughter of Kitkat and the wife of Dairy Milk. Kitkat is the son-in-law of Bourneville. Munch is the granddaughter of 5 Star. How is Munch related to Milky bar?
The given bar graph shows the sales of cars from six branches of a dealer B1, B2, B3, B4, B5, B6, during two consecutive years 2018 and 2019. The 1st bar corresponds to the year 2018 and the 2nd bar corresponds to the year 2019. In the bar graph, the ratio of the total sales from branches B1, B2 and B3 taken together for the year 2018 to the sales from the branches B6, B4 and B5 for the year 2019, is:
In a survey conducted in a city, it was found that 25% of the people going to a bar on Saturday were females. But, the number of females going to the bar on Sunday is 80% less than that on Saturday. If the total number of people going to the bar on Sunday decreased by 50% as compared to that on Saturday, what is the percentage decrease in the number of males going to the bar on Sunday as compared to Saturday?
An aluminium bar of 8 m length and a steel bar of 5 mm longer in length are kept at 30°C. If the ambient temperature is raised gradually, at what temperature the aluminium bar will elongate 5 mm longer than the steel bar (the linear expansion coefficients for steel and aluminium are 12 × 10-6/°C and 23 × 10-6/°C respectively)?