Question

Assertion :   An ac generator is based on the phenomenon of self-induction.

Reason     : In single coil, we consider self-induction only.

(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.

(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.

(c) If assertion is true but reason is false.

(d) If assertion is false but reason is true.

Answer

(d) If assertion is false but reason is true.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

The coefficient of mutual induction between two coils is 4H. If the current in the primary reduces from 5A to zero in 10-3 second then the induced emf in the secondary coil will be
Which of the following is true?
Electric conduction in a semiconductor takes place due to:

The magnetic induction at the centre O in the figure shown is

(a)

(b)

(c)       

(d)  (

A straight conductor of length 0.4 m is moved with a speed of 7 m/s perpendicular to the magnetic field of intensity of 0.9 Wb/m2. The induced e.m.f. across the conductor will be

(a) 7.25 V

(b) 3.75 V

(c) 1.25 V

(d) 2.52 V

The coefficient of mutual induction between two coils is 1.25H. If the rate of fall of current in the primary is 80 As-1, then the induced emf in the secondary coil will be.

Two capacitors C1 and C2 = 2C1 are connected in a circuit with a switch between them as shown in the figure. Initially the switch is open and C1 holds charge Q. The switch is closed. At steady state, the charge on each capacitor will be

(a) Q, 2Q

(b) Q/3, 2Q/3

(c) 3Q/2, 3Q

(d) 2Q/3, 4Q/3

For a short magnet with magnetic dipole moment $\vec{m}$, its magnetic field at distance $d$ from its centre on its equator is __________ .
Light of wavelength $\lambda$ falls on a metal having work function $\frac{\text{h}_\text{c}}{\lambda_0}.$ Photoelectric effect will take place only if:

  1. $\lambda\geq\lambda_0$

  2. $\lambda\geq2\lambda_0$

  3. $\lambda\leq\lambda_0$

  4. $\lambda<\frac{\lambda_ 0}{2}.$

A narrow electron beam passes undeviated through an electric field E = 3  and an overlapping magnetic field B = 2 . If electric field and magnetic field are mutually perpendicular. The speed of the electrons is

(a) 60 m/s

(b) 10.3  

(c) 1.5  

(d) 0.67