Moving Charges and Magnetism — Physics STD 12 Science — Question

The current inside a copper voltameter

(a) Is half the outside value	(b) Is the same as the outside value
(c) Is twice the outside value	(d) Depends on the concentration of

The equivalent capacitance of the combination shown in figure is:

If threshold wavelength for sodium is 6800Å then the work function will be

(a) 1.8 eV

(b) 2.5 eV

(c) 2.1 eV

(d) 1.4 eV

Which of the following is not the function of a NOT gate?

The amplitude of the magnetic field of a harmonic electromagnetic wave in vacuum is B_0​ = 510nT. The amplitude of the electric field part of the wave is:

Hysterisis is the phenomenon of lagging of:

When a dielectric material is introduced between the plates of a charged condenser then electric field between the plates

(a) Decreases

(b) Increases

(c) Remain constant

(d) First (b) then (a)

Same current is flowing through two identical coils. Their centers are common and their planes are mutually perpendicular. Magnetic field at the center due to one coil is B then the resultant magnetic field at the common center is :

A helium nucleus makes a full rotation in a circle of radius 0.8 metre in two seconds. The value of the magnetic field B at the centre of the circle will be

(a)

(b)

(c) 2

(d)

If an insulated non-conducting sphere of radius R has charge density ρ. The electric field at a distance r from the centre of sphere (r < R)  will be

(a)

(b)

(c)

(d)