Two straight wires each 10 cm long are parallel to one another and seperated by 2 cm. When the current flowing in them is 30A and 40 A respectively, then the force experienced by either […]
The magnetic field at a point on the axis of a long solenoid having 5 turns per cm length when a current of 0.8 A flows through it is
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(a) 5.024×10⁻⁸ Wb/m² […]
A long straight wire is carrying a current of 12 A. The magnetic field at a distance of 8 cm is (μ₀=4πx10⁻⁷ N A²)
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(a) 2×10⁻⁴ Wb/m² (b) 3×10⁻⁵ Wb/m² (c) 4×10⁻⁴Wb/m² […]
The horizontal and vertical components of earth’s magnetic field at a place are 0.3 G and 0.52 G. The earth’s magnetic field and the angle of dip are
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(a) 0.3 G and δ=30⁰ […]
The distance of the moon form the earth is 3.8×10⁵ km. Supposing that the eye is most sensitive to the light of wavelength 550 nm, the seperation of two points on the moon that can […]
A person has a minimum distance of distinct vision as 50 cm. The power of lenses required to read a book at a distance of 25 cm is
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(a) 3 D (b) […]
When an object is placed 40cm from a diverging lens, its virtual image is formed 20 cm from the lens. The focal length and power of lens are
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(a) F=-20 cm, P=-5 D […]
An object is 8 cm high. It is desired to form a real image 4 cm high at 60 cm from the mirror. The type of mirror needed with the focal length is
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At place on earth, the vertical component of earth’s magnetic field is √3 times its horizontal component. The angle of dip at this place is …….
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(a) 60⁰ (b) 30⁰ (c) 45⁰ (d) […]
Two identical capacitors are first connected in series and then in parallel. The ratio of equivalent capacitance is
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(a) (1:1) (b) (1:2) (c) (1:3) (d) (1:4)
Correct Answer:
(1:4)
Explanation:
No explanation […]
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