- AVolt
- BVolt per metre
- CVolt metre
- DNone of these
Explanation:
E.m.f of a cell is defined as the maximum potential difference across the cell when no current flows through the circuit.
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When a hydrogen atom is raised from the ground state to an excited state
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(a) P.E. increases and K.E. decreases |
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(b) P.E. decreases and K.E. increases |
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(c) Both kinetic energy and potential energy increase |
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(d) Both K.E. and P.E. decrease |
A diffraction is obtained by using a beam of red light. What will happen if the red light is replaced by the blue light
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(a) Bands will narrower and crowd full together |
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(b) Bands become broader and further apart |
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(c) No change will take place |
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(d) Bands disappear |
You are given a resistance wire of length 50 cm and a battery of negligible resistance. In which of the following cases is largest amount of heat generated
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(a) When the wire is connected to the battery directly |
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(b) When the wire is divided into two parts and both the parts connected to the battery in parallel |
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(c) When the wire is divided into four parts and all the four connected to the battery in parallel |
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(d) When only half the wire is connected to the battery |
A circular current carrying coil has a radius R. The distance from the centre of the coil on the axis where the magnetic induction will be to its value at the centre of the coil, is
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(a) |
(b) R |
(c) 2 |
(d) |
An electron is accelerated by a potential difference of 12000 volts. It then enters a uniform magnetic field of applied perpendicular to the path of electron. Find the radius of path. Given mass of electron = 9
and charge on electron = 1.6
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(a) 36.7 m |
(b) 36.7 cm |
(c) 3.67 m |
(d) 3.67 cm |