A ball dropped on to the floor from a height of 10 m rebounds to a height of 2.5 m. If the ball is in contact with the floor for 0.02s, its average acceleration during contact is

A long cylindrical wire carries a positive charge of linear density l. An electron (- e,m) revolves around it in a circular path under the influence of the attractive electrostatic force.The speed of electron is

A current carrying power line carries current from west to east. The direction of magnetic field 1m above is

A current element of strength&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><msqrt><mn>2</mn></msqrt><mo>×</mo><msup><mn>10</mn><mrow><mo>−</mo><mn>4</mn></mrow></msup><mi>Am</mi></math>&nbsp;is placed at the corner A of a square ABCD of side 10 cm parallel one side. Magnetic field induction at the point which is at diagonally opposite corner of the square to the element is (The element lies along the side AB)

The value of magnetic field due to a small element of current carrying conductor at a distance r and lying on the plane perpendicular to the element of the conductor is?

The value of the intensity of the magnetic field at a point due to a current-carrying conductor depends on the?&nbsp;

A ball dropped on to the floor from a height of 10 m rebounds to a height of 2.5 m. If the ball is in contact with the floor for 0.02s, its average acceleration during contact is

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