CBSE Physics Magnetic Effects of Current Expected Questions for Quick Revision : Unit IV
Short/V. Short Answer Questions 1-2 Marks Each
1. A current is set up in a long copper pipe. Is there a magnetic field (i) inside ; (ii) outside the
pipe ?
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2. Consider the circuit shown where APB and AQB are semicircles. What will be the mag¬netic field at the centre C of a circular loop ?
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3. Under what conditions the force acting on a charge moving through a uniform magnetic field., minimum ?
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4. What will be the path of a charged particle moving along the direction of a uniform magnetic field?
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5. An electron beam passes through regions of closed electric and magnetic fields of intensity E and B respectively! For what value of electron speed the beam will remain undeflected ?
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6. Write down the expression for the force on a current carrying conductor balanced in a magnetic field.
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7. State Fleming’s left hand rule.
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8. State Fleming’s right hand rule.
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9. Out of an ammeter and a voltmeter, which of the two has greater resistance and why ?
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10. An ordinary moving coil galvanometer used for dx. cannot be used to measure an alternating current even if the frequency is low. Explain why ?
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11. In a chamber of uniform magnetic filed B, an electron beam enters with a velocity by the
electrons.
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12. The coil of a galvanometer has a resistance of 100 Q. It shows full scale deflection for a current
of 5 X 10-4 A. How will you convert it into a voltmeter to read P.D. of 5 V ?
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