ELECTRIC CURRENT AND DRIFT VELOCITY
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Current Electricity

268414 In a hydrogen tube it isobserved that through a given cross - section \(3.13 \times 10^{15}\) electrons per sec, moving from right to left and \(3.12 \mathrm{x}\) \(10^{15}\) protons per sec are moving from left to right. The electric current in the discharge tube and its direction is

1 \(1 \mathrm{~mA}\) towards left
2 \(1 \mathrm{~mA}\) towards right
3 \(1.5 \mathrm{~mA}\) towards right
4 \(2 \mathrm{~mA}\) towardsleft
Current Electricity

268415 An electron of mass \(m\), moves around the nucleus in a circular orbit of radius ' \(r\) ' under the action of centripetal force ' \(F\) '. The equivalent electric current is

1 \(\frac{e}{2 \pi} \sqrt{\frac{F}{m r}}\)
2 \(\frac{e}{\pi} \sqrt{\frac{F r}{m}}\)
3 \(\frac{e}{2 \pi} \sqrt{\frac{F m}{r}}\)
4 \(\frac{e}{\pi} \sqrt{\frac{F m}{r}}\)
Current Electricity

268416 The current in a conductor varies with time ' \(\mathbf{t}\) ' as \(I=3 t+4 t^{2}\). Where \(I\) in amp and \(t\) in sec. The electric charge flows through the section of the conductor between \(t=1\) and \(\mathrm{t}=3 \mathrm{~s}\)

1 \(\frac{100}{3} C\)
2 \(\frac{127}{4} C\)
3 \(\frac{140}{3} C\)
4 \(\frac{150}{3} C\)
Current Electricity

268417 A conductor has a non-uniform section as shown in the figure. A steady current is flowing through it. Then the drift speed of the electrons
( \(M\)-2012)

1 is constant throughout thewire
2 varies unpredictably
3 decreases fromP \& \(\mathrm{Q}\)
4 increases fromP to \(Q\)
Current Electricity

268414 In a hydrogen tube it isobserved that through a given cross - section \(3.13 \times 10^{15}\) electrons per sec, moving from right to left and \(3.12 \mathrm{x}\) \(10^{15}\) protons per sec are moving from left to right. The electric current in the discharge tube and its direction is

1 \(1 \mathrm{~mA}\) towards left
2 \(1 \mathrm{~mA}\) towards right
3 \(1.5 \mathrm{~mA}\) towards right
4 \(2 \mathrm{~mA}\) towardsleft
Current Electricity

268415 An electron of mass \(m\), moves around the nucleus in a circular orbit of radius ' \(r\) ' under the action of centripetal force ' \(F\) '. The equivalent electric current is

1 \(\frac{e}{2 \pi} \sqrt{\frac{F}{m r}}\)
2 \(\frac{e}{\pi} \sqrt{\frac{F r}{m}}\)
3 \(\frac{e}{2 \pi} \sqrt{\frac{F m}{r}}\)
4 \(\frac{e}{\pi} \sqrt{\frac{F m}{r}}\)
Current Electricity

268416 The current in a conductor varies with time ' \(\mathbf{t}\) ' as \(I=3 t+4 t^{2}\). Where \(I\) in amp and \(t\) in sec. The electric charge flows through the section of the conductor between \(t=1\) and \(\mathrm{t}=3 \mathrm{~s}\)

1 \(\frac{100}{3} C\)
2 \(\frac{127}{4} C\)
3 \(\frac{140}{3} C\)
4 \(\frac{150}{3} C\)
Current Electricity

268417 A conductor has a non-uniform section as shown in the figure. A steady current is flowing through it. Then the drift speed of the electrons
( \(M\)-2012)

1 is constant throughout thewire
2 varies unpredictably
3 decreases fromP \& \(\mathrm{Q}\)
4 increases fromP to \(Q\)
Current Electricity

268414 In a hydrogen tube it isobserved that through a given cross - section \(3.13 \times 10^{15}\) electrons per sec, moving from right to left and \(3.12 \mathrm{x}\) \(10^{15}\) protons per sec are moving from left to right. The electric current in the discharge tube and its direction is

1 \(1 \mathrm{~mA}\) towards left
2 \(1 \mathrm{~mA}\) towards right
3 \(1.5 \mathrm{~mA}\) towards right
4 \(2 \mathrm{~mA}\) towardsleft
Current Electricity

268415 An electron of mass \(m\), moves around the nucleus in a circular orbit of radius ' \(r\) ' under the action of centripetal force ' \(F\) '. The equivalent electric current is

1 \(\frac{e}{2 \pi} \sqrt{\frac{F}{m r}}\)
2 \(\frac{e}{\pi} \sqrt{\frac{F r}{m}}\)
3 \(\frac{e}{2 \pi} \sqrt{\frac{F m}{r}}\)
4 \(\frac{e}{\pi} \sqrt{\frac{F m}{r}}\)
Current Electricity

268416 The current in a conductor varies with time ' \(\mathbf{t}\) ' as \(I=3 t+4 t^{2}\). Where \(I\) in amp and \(t\) in sec. The electric charge flows through the section of the conductor between \(t=1\) and \(\mathrm{t}=3 \mathrm{~s}\)

1 \(\frac{100}{3} C\)
2 \(\frac{127}{4} C\)
3 \(\frac{140}{3} C\)
4 \(\frac{150}{3} C\)
Current Electricity

268417 A conductor has a non-uniform section as shown in the figure. A steady current is flowing through it. Then the drift speed of the electrons
( \(M\)-2012)

1 is constant throughout thewire
2 varies unpredictably
3 decreases fromP \& \(\mathrm{Q}\)
4 increases fromP to \(Q\)
Current Electricity

268414 In a hydrogen tube it isobserved that through a given cross - section \(3.13 \times 10^{15}\) electrons per sec, moving from right to left and \(3.12 \mathrm{x}\) \(10^{15}\) protons per sec are moving from left to right. The electric current in the discharge tube and its direction is

1 \(1 \mathrm{~mA}\) towards left
2 \(1 \mathrm{~mA}\) towards right
3 \(1.5 \mathrm{~mA}\) towards right
4 \(2 \mathrm{~mA}\) towardsleft
Current Electricity

268415 An electron of mass \(m\), moves around the nucleus in a circular orbit of radius ' \(r\) ' under the action of centripetal force ' \(F\) '. The equivalent electric current is

1 \(\frac{e}{2 \pi} \sqrt{\frac{F}{m r}}\)
2 \(\frac{e}{\pi} \sqrt{\frac{F r}{m}}\)
3 \(\frac{e}{2 \pi} \sqrt{\frac{F m}{r}}\)
4 \(\frac{e}{\pi} \sqrt{\frac{F m}{r}}\)
Current Electricity

268416 The current in a conductor varies with time ' \(\mathbf{t}\) ' as \(I=3 t+4 t^{2}\). Where \(I\) in amp and \(t\) in sec. The electric charge flows through the section of the conductor between \(t=1\) and \(\mathrm{t}=3 \mathrm{~s}\)

1 \(\frac{100}{3} C\)
2 \(\frac{127}{4} C\)
3 \(\frac{140}{3} C\)
4 \(\frac{150}{3} C\)
Current Electricity

268417 A conductor has a non-uniform section as shown in the figure. A steady current is flowing through it. Then the drift speed of the electrons
( \(M\)-2012)

1 is constant throughout thewire
2 varies unpredictably
3 decreases fromP \& \(\mathrm{Q}\)
4 increases fromP to \(Q\)