Materials suitable for making electromagnets should have

high retentivity and high coercivity

high retentivity and low coercivity

low retentivity and low coercivity

low retentivity and high coercivity

A thin wire of length L and mass M is bent to form a semicircle. What is the magnitude of gravitational field at the centre?

πGM/L along the line joining the ends

πGM/L 2 perpendicular to the line joining the ends

2 πGM/L 2 along the line joining the ends

2 πGM/L 2 perpendicular to the line joining the ends

Directions: This question has Statement 1 and Statement 2. Of the four choices given after the statements, choose the one that best describes the two statements. If two springs S 1 and S 2 of force constants k 1 and k 2 , respectively, are stretched by the same force, then it is found that more work is done on spring S 1 than on spring S 2 . Statement 1: If stretched by the same amount, work done on S 1 will be more than that on S 2 . Statement 2: k 1 < k 2

Statement 1 is true, but Statement 2 is false.

Statement 1 is true, but Statement 2 is true. Statement 2 is the correct explanation of Statement 1.

Statement 1 and Statement 2 are true. Statement 2 is not the correct explanation of Statement 1.

Statement 1 is false, but Statement 2 is true.

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