- Awill decrease
- ✓will increase
- Cwill remain unchanged
- Dinitially it will decrrase, then it will increase and the bubble will burst
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Two charges + 5μC and +10 μC are placed 20 cm apart. The net electric field at the mid-Point between the two charges is
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(a) 4.5 |
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(b) 4.5 |
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(c) 13.5 |
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(d) 13.5 |
A potentiometer wire has length 10 m and resistance 20Ω. A 2.5 V battery of negligible internal resistance is connected across the wire with an 80 Ω series resistance. The potential gradient on the wire will be
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(a) 5 |
(b) 2.5 |
(c) 0.62 |
(d) 1 |
AB and CD are long straight conductor, distance d apart, carrying a current I. The magnetic field at the midpoint of BC is
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(a) |
(b) |
(c) |
(d) |
In a photo cell, the photo-electrons emission takes place
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(a) After 10–1 sec on incident of light rays |
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(b) After 10–3 sec on incident of light rays |
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(c) After 10–6 sec on incident of light rays |
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(d) After 10–8 sec on incident of light rays |
An electron moving with a uniform velocity along the positive x-direction enters a magnetic field directed along the positive y-direction. The force on the electron is directed along
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(a) Positive y-direction |
(b) Negative y-direction |
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(c) Positive z-direction |
(d) Negative z-direction |