- Aleads the voltage by 180
- Blags the voltage by 90
- Cleads the voltage by 90
- Dremains in phase with the voltage
Explanation:
Current leads by 90°.
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The figure shows a double slit experiment P and Q are the slits. The path lengths PX and QX are nλ and (n+2)λ respectively, where n is a whole number and λ is the wavelength. Taking the central fringe as zero, what is formed at X
|
(a) First brigh |
(b) First dark |
(c) Second bright |
(d) Second dark |
In the given figure, battery E is balanced on 55 cm length of potentiometer wire but when a resistance of 10 W is connected in parallel with the battery then it balances on 50 cm length of the potentiometer wire then internal resistance r of the battery is

|
(a) 1 W |
(b) 3 W |
(c) 10 W |
(d) 5 W |
Radio waves and visible light in vacuum have
|
(a) Same velocity but different wavelength |
|
(b) Continuous emission spectrum |
|
(c) Band absorption spectrum |
|
(d) Line emission spectrum |
A magnifying glass is to be used at the fixed object distance of 1 inch. If it is to produce an erect image magnified 5 times its focal length should be
|
(a) 0.2 inch |
(b) 0.8 inch |
(c) 1.25 inch |
(d) 5 inch |
The magnifying power of a microscope with an objective of 5 mm focal length is 400. The length of its tube is 20 cm. Then the focal length of the eye-piece is
|
(a) 200 cm |
(b) 160 cm |
(c) 2.5 cm |
(d) 0.1 cm |
Which of the following is constructed on the principle of electromagnetic induction
|
(a) Galvanometer |
(b) Electric motor |
(c) Generator |
(d) Voltmeter |