Science (English Medium) Class 12 - CBSE Question Bank Solutions for Physics

The deflection in a moving coil galvanometer is ______.

The current sensitivity of a galvanometer is defined as ______.

The unit of electric dipole moment is ______.

In a moving coil galvanometer the deflection (Φ) on the scale by a pointer attached to the spring is ______.

A moving coil galvanometer can be converted into an ammeter by ______.

The conversion of a moving coil galvanometer into a voltmeter is done by ______.

An electric dipole of moment p is placed parallel to the uniform electric field. The amount of work done in rotating the dipole by 90° is ____________.

The coil of a moving coil galvanometer is wound over a metal frame in order to ______.

The current sensitivity of a galvanometer increase by 20%. If its resistance also increases by 25%, the voltage sensitivity will ______.

Assertion (A): On Increasing the current sensitivity of a galvanometer by increasing the number of turns may not necessarily increase its voltage sensitivity.

Reason (R): The resistance of the coil of the galvanometer increases on increasing the number of turns.

Select the most appropriate answer from the options given below:

Two charges –q each are fixed separated by distance 2d. A third charge q of mass m placed at the mid-point is displaced slightly by x(x << d) perpendicular to the line joining the two fixed charged as shown in figure. Show that q will perform simple harmonic oscillation of time period.

`T = [(8pi^3 ε_0 md^3)/q^2]^(1/2)`

Figure shows some equipotential lines distributed in space. A charged object is moved from point A to point B.

(i)	(ii)	(iii)

A multirange voltmeter can be constructed by using a galvanometer circuit as shown in figure. We want to construct a voltmeter that can measure 2V, 20V and 200V using a galvanometer of resistance 10Ω and that produces maximum deflection for current of 1 mA. Find R₁, R₂ and R₃ that have to be used.

A multirange current meter can be constructed by using a galvanometer circuit as shown in figure. We want a current meter that can measure 10 mA, 100 mA and 1A using a galvanometer of resistance 10 Ω and that prduces maximum deflection for current of 1mA. Find S₁, S₂ and S₃ that have to be used

Would sky waves be suitable for transmission of TV signals of 60 MHz frequency?

The electric potential V as a function of distance X is shown in the figure.

The graph of the magnitude of electric field intensity E as a function of X is ______.