The magnitude and direction of the current in the following circuit is:
         
1. \(1.5~\text{A}\) from \(\mathrm{B}\) to \(\mathrm{A}\) through \(E\)
2. \(0.2~\text{A}\) from \(\mathrm{B}\) to \(\mathrm{A}\) through \(E\)
3. \(0.5~\text{A}\)  from \(\mathrm{A}\) to \(\mathrm{B}\) through \(E\)
4. \(\frac{5}{9}~\text{A}\) from \(\mathrm{A}\) to \(\mathrm{B}\) through \(E\)

 
Subtopic:  Kirchoff's Voltage Law |
 68%
From NCERT
NEET - 2023
Please attempt this question first.
Hints
Please attempt this question first.

If the galvanometer \(\mathrm{G}\) does not show any deflection in the circuit shown, the value of \(\mathrm{R}\) is given by:
        
\(\)
1. \(400~\Omega\)
2. \(200~\Omega\)
3. \(50~\Omega\)
4. \(100~\Omega\)
Subtopic:  Kirchoff's Voltage Law |
From NCERT
NEET - 2023
Please attempt this question first.
Hints
Please attempt this question first.

\(10\) resistors, each of resistance \(R\) are connected in series to a battery of \(E\) and negligible internal resistance. Then those are connected in parallel to the same battery, the current is increased \(n\) times. The value of \(n\) is: 
1. \(1000\) 2. \(10\)
3. \(100\) 4. \(1\)
Subtopic:  Combination of Resistors |
 63%
From NCERT
NEET - 2023
Please attempt this question first.
Hints
Please attempt this question first.

The resistance of platinum wire at \(0^{\circ} \text{C}\) is \(2~ \Omega\) and \(6.8~ \Omega\) at \(80^{\circ}\text{C}\). The temperature coefficient of resistance of the wire is:
1. \((3\times 10^{-1})^\circ \text{C}^{-1}\) 2. \((3 \times 10^{-4})^\circ \text{C}^{-1}\)
3. \((3 \times 10^{-3})^\circ \text{C}^{-1}\) 4. \((3 \times 10^{-2})^\circ \text{C}^{-1}\)
Subtopic:  Derivation of Ohm's Law |
 65%
From NCERT
NEET - 2023
Please attempt this question first.
Hints
Please attempt this question first.

On the basis of electrical conductivity, which one of the following material has the smallest resistivity?
1. Germanium 
2. Silver
3. Glass
4. Silicon 
Subtopic:  Derivation of Ohm's Law |
 62%
From NCERT
NEET - 2023
Please attempt this question first.
Hints
Please attempt this question first.

A certain wire \(A\) has resistance \(81\) \(\Omega\). The resistance of another wire \(B\) of the same material and equal length but of diameter thrice the diameter of \(A\) will be:
1. \(81\) \(\Omega\) 2. \(9\) \(\Omega\)
3. \(729\) \(\Omega\) 4. \(243\) \(\Omega\)
Subtopic:  Derivation of Ohm's Law |
 74%
From NCERT
NEET - 2023
Please attempt this question first.
Hints
Please attempt this question first.

A copper wire of radius \(1\) mm contains \(10^{22}\) free electrons per cubic metre. The drift velocity for free electrons when \(10\) A current flows through the wire will be:
(Given, charge on electron = \(1.6\times10^{-19}\) C)
1. \(\frac{6.25\times10^4}{\pi}\) m/s
2. \(\frac{6.25}{\pi}\times10^3\) m/s
3. \(\frac{6.25}{\pi}\) m/s
4. \(\frac{6.25\times10^5}{\pi}\) m/s
Subtopic:  Current & Current Density |
 71%
From NCERT
NEET - 2023
Please attempt this question first.
Hints
Please attempt this question first.

The emf of a cell having internal resistance \(1~ \Omega\) is balanced against a length of \(330~\text{cm}\) on a potentiometer wire. When an external resistance of \(2 ~\Omega\) is connected across the cell, the balancing length will be: 
1. \(220~\text{cm}\) 
2. \(330~\text{cm}\)
3. \(115~\text{cm}\)
4. \(332~\text{cm}\)
Subtopic:  Meter Bridge & Potentiometer |
 51%
From NCERT
NEET - 2023
Please attempt this question first.
Hints
Please attempt this question first.

Two resistors of resistance, \(100\) \(\Omega\) and \(200\) \(\Omega\) are connected in parallel in an electrical circuit. The ratio of the thermal energy developed in \(100\) \(\Omega\) resistor to that in \(200\) \(\Omega\) resistor in a given time is:
1. \(4:1\)
2. \(1:2\)
3. \(2:1\)
4. \(1:4\)
Subtopic:  Heating Effects of Current |
 67%
From NCERT
NEET - 2022
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

A copper wire of length \(10\) m and radius \(\left({10^{-2}/\sqrt{\pi}}\right)\) m has an electrical resistance of \(10\) \(\Omega\). The current density in the wire for an electric field strength of \(10\) (V/m) is: 
1. \(10^{5}\) A/m2
2. \(10^{4}\) A/m2
3. \(10^{6}\) A/m2
4. \(10^{-5}\) A/m2
Subtopic:  Current & Current Density |
 65%
From NCERT
NEET - 2022
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh