- AThe emitter has the least concentration of impurity.
- BThe collector has the least concentration of impurity.
- CThe base has the least concentration of impurity.
- DAll the three regions have equal concentrations of impurity.
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The radius of a circular loop is r and a current i is flowing in it. The equivalent magnetic moment will be
|
(a) ir |
(b) 2πir |
(c) iπ |
(d) |
Consider the following two statements A and B, and identify the correct choice out of given answers
A. Thermo e.m.f. is minimum at neutral temperature of a thermocouple
B. When two junctions made of two different metallic wires are maintained at different temperatures, an electric current is generated in the circuit.
|
(a) A is false and B is true |
(b) A is true and B is false |
|
(c) Both A and B are false |
(d) Both A and B are true |
A particle A has charge +q and a particle B has charge +4q with each of them having the same mass m. When allowed to fall from rest through the same electric potential difference, the ratio of their speed
will become
|
(a) 2 : 1 |
(b) 1 : 2 |
(c) 1 : 4 |
(d) 4 : 1 |