AIPMT 2015 | Current Electricity Question 46 | Physics

AIPMT 2015

MCQ (Single Correct Answer)

-1

Two metal wires of identical dimensions are connected in series. If $$\sigma $$₁ and $$\sigma $$₂ are the conductivity of the combination is

$${{{\sigma _1} + {\sigma _2}} \over {{\sigma _1}{\sigma _2}}}$$

$${{{\sigma _1}{\sigma _2}} \over {{\sigma _1} + {\sigma _2}}}$$

$${{2{\sigma _1}{\sigma _2}} \over {{\sigma _1} + {\sigma _2}}}$$

$${{{\sigma _1} + {\sigma _2}} \over {2{\sigma _1}{\sigma _2}}}$$

AIPMT 2015 Cancelled Paper

MCQ (Single Correct Answer)

-1

A potentiometer wire has length 4 m and resistance 8 $$\Omega $$. The resistance that must be connected in series with the wire and an accumulator of e.m.f. 2 V, so as to get a potential gradient 1 mV per cm on the wire is

44 $$\Omega $$

48 $$\Omega $$

32 $$\Omega $$

40 $$\Omega $$

AIPMT 2015 Cancelled Paper

MCQ (Single Correct Answer)

-1

A, B and C are voltmeters of resistance R, 1.5 R and 3R respectively as shown in the figure. When some potential difference is applied between X and Y, the voltmeter readings are V_A, V_B and V_C respectively, Then

AIPMT 2015 Cancelled Paper Physics - Current Electricity Question 98 English

AIPMT 2015 Cancelled Paper Physics - Current Electricity Question 98 English

V_A = V_B $$ \ne $$ V_C

V_A $$ \ne $$ V_B $$ \ne $$ V_C

V_A = V_B = V_C

V_A $$ \ne $$ V_B = V_C

AIPMT 2015 Cancelled Paper

MCQ (Single Correct Answer)

-1

Across a metallic conductor of non-uniform cross section a constant potential difference is applied. The quantity which remains constant along the conductor is

drift velocity

electric field

current density

current

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