A long straight wire carrying current of 30A is placed in an external uniform magnetic field of induction 4 x 10⁻⁴ T. The magnetic field is acting parallel to the direction of the current. The […]
A satellite is launched into a circular orbit of radius R around earth while a second satellite is launched into an orbit of radius 1.02R. The percentage difference in the time periods of the two […]
Three unequal resistors in parallel are equivalent to a resistance 1 Ω. If two of them are in the ratio 1:2 and if no resistance value is fractional, the largest of the three resistances in […]
If the length of a stretched string is shortened by 4% and the tension is increased by 44%, then the ratio of the final and initial fundamental frequencies is
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(a) (2:1) (b) […]
A circular disc of radius R and thickness R/6 has moment of inertia I about an axis passing through its centre and perpendicular to tis plane. It is melted and recasted into a solid sphere. […]
An object is attached to the bottom of a light vertical spring and set vibrating. The maximum speed of the object is 15cm/sec and the period is 628 mili-sec. The amplitude of the motion in […]
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