Two PN-junctions can be connected in series by three different methods as shown in the figure. If the potential difference in the junctions is the same, then the correct connections will be (a) In the circuit (1) and (2) (b) In the circuit (2) and (3) (c) In the circuit (1) and (3) (d) Only in the circuit (1)

Two PN-junctions can be connected in series by three different me…

When is the angle of dip at a place equal to 45^o?

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Consider a long, straight wire of cross-sectional area A carrying a current i. Let there be n free electrons per unit volume. An observer places himself on a trolley moving in the direction opposite to the current with a speed $\text{v}=\frac{\text{i}}{\text{nAe}}$ and separated from the wire by a distance r. The magnetic field seen by the observer is very nearly:

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The figures represent three cases of a ray passing through a prism of angle A. The case corresponding to minimum deviation is

(a) 1

(b) 2

(c) 3

(d) None of these

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The internal resistance of dry cell is ...A..., than the internal resistance of common electrolytic cell. Here, A refers to:

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A radioactive substance emits

(a) a-rays

(b) b-rays

(c) g-rays

(d) All of these

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The experiment required to demonstrate the electromagnetic induction was performed by :

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The radius of circular path of an electron when subjected to a perpendicular magnetic field is

(a)

(b)

(c)

(d)

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A diode, a resistor and a 50Hz AC source are connected in series. The number of current pulses per second through the resistor is:

25
50
100
200

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In a certain arrangement, a proton does not get deflected while moving through a magnetic field region. Under what condition is it possible?

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A current carrying coil is placed with its axis perpendicular to N-S direction. Let horizontal component of earth's magnetic field be H_o and magnetic field inside the loop is H. If a magnet is suspended inside the loop, it makes angle θ with H. Then θ =

(a)