Magnetism
A square-shaped copper coil has edges of length $$50\, cm$$ and contains $$50$$ turns. It is placed perpendicular to a $$1.0 T$$ magnetic field. It is removed from the magnetic field in $$0.25\, s$$ and restored in its original place in the next $$0.25\, s$$. Suppose the resistance of the coil is $$25\Omega$$. Assume that the coil moves with uniform velocity during its removal and restoration. Find the thermal energy developed in the coil during (a) its removal (b) its restoration and (c) its motion
Magnetism
When a magnet M is pushed in and out of a circular coil C connected to a very sensitive galvanometer G as shown in the figure with frequency f then which of the following holds true ?
Magnetism
A circular coil of 500 turns of wire has an enclosed area of $$ 0.1 m^2 $$ per turn.It is kept perpendicular to a magnetic induction of 0.2 T and rotated by $$ 180^o $$ about a diameter perpendicular to the field in 0.1 second. How much charge will pass when the coil is connected to a galvanometer with a combined resistance of
Magnetism
A tangent galvanometer has a coil with $$50$$ turns and radius equal to $$4$$ cm. A current of $$0.1$$ Amp is passing through it. The plane of the coil is set parallel to the earth's magnetic meridian. If the value of the earth's horizontal component of the magnetic field is $$7\times 10^{-5}T$$ and $$\mu_0= 4\pi \times 10^{-7}Wb/A-m$$. then the deflection in the galvanometer needle will be :
Magnetism
To make the magnetic field radial in a moving coil galvanometer:-
Magnetism
The following diagram in Fig. 10.44 shows a coil X connected to a sensitive centre - zero galvanometer G and a coil P connected to a battery through a switch S.
(a) Describe the observation when the switch S is (i) closed suddenly. (ii) then kept closed, (iii) finally opened.
(b) Name and state the law which explains the above observations.
Magnetism
A current of $$10^{-5}$$ A produces a deflection of $$10^{0}$$ in a moving coil galvanometer. A current of $$10^{-6}$$ amp in the same galvanometer produces a deflection of
Magnetism
The area of the coil in a moving coil galvanometer is 15 $$cm^{2}$$ and has 20 turns. The magnetic induction is 0.2 T and the couple per unit twist of the suspended wire is $$10^{-6}$$ Nm per degree. If the deflection is $$45^{0}$$ , the current passing through it is :
Magnetism
A magnet kept at the centre of two coils A and B is moved to and for as shown in the diagram. The two galvanometers show deflection. State with a reason whether :
$$x > y \,or\, x
